Minecraft - Shields with only one command

/summon FallingSand ~ ~2 ~ {Riding:{Riding:{Riding:{Riding:{Riding:{Riding:{Riding:{Riding:{Riding:{Riding:{Riding:{Riding:{Riding:{Riding:{Riding:{Riding:{Riding:{Riding:{Riding:{TileEntityData:{Command:"/fill ~2 ~-1 ~2 ~-2 ~4 ~14 stained_glass 0 hollow",id:"Control"},id:"FallingSand",Block:"command_block",Time:1},TileEntityData:{Command:"/fill ~2 ~-2 ~2 ~-2 ~-2 ~14 bedrock",id:"Control"},id:"FallingSand",Block:"command_block",Time:1},TileEntityData:{Command:"/fill ~1 ~-2 ~3 ~-1 ~4 ~13 air",id:"Control"},id:"FallingSand",Block:"command_block",Time:1},TileEntityData:{Command:"/fill ~1 ~-3 ~12 ~-1 ~0 ~12 redstone_block",id:"Control"},id:"FallingSand",Block:"command_block",Time:1},TileEntityData:{Command:"/summon FallingSand ~-1 ~3 ~11 {Riding:{Riding:{Riding:{TileEntityData:{Command:\"/scoreboard objectives add shield dummy\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"/scoreboard objectives add Dshield dummy\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"/scoreboard objectives add Gshield dummy\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},id:\"FallingSand\",Block:\"iron_block\",Time:1}",id:"Control"},id:"FallingSand",Block:"command_block",Time:1},TileEntityData:{Command:"/summon FallingSand ~-1 ~17 ~13 {Riding:{Riding:{Riding:{TileEntityData:{Command:\"/scoreboard objectives add Ishield dummy\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"/scoreboard objectives add Sshield dummy\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"/scoreboard objectives add Wshield dummy\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},id:\"FallingSand\",Block:\"iron_block\",Time:1}",id:"Control"},id:"FallingSand",Block:"command_block",Time:1},TileEntityData:{Command:"/summon FallingSand ~0 ~31 ~11 {Riding:{Riding:{Riding:{TileEntityData:{Command:\"/fill ~-2.0 ~4 ~3 ~2.0 ~4 ~-9 bedrock\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"/title @a title {text:\\\"Command created by McTsts\\\",color:gold}\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"/tellraw @a {text:\\\"Filter created by Crushed Pixel\\\",color:gold}\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},id:\"FallingSand\",Block:\"iron_block\",Time:1}",id:"Control"},id:"FallingSand",Block:"command_block",Time:1},TileEntityData:{Command:"/summon FallingSand ~-1 ~2 ~3 {Riding:{Riding:{Riding:{TileEntityData:{Command:\"/fill ~1 ~ ~ ~1 ~3 ~7 stone\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"/scoreboard players set @a Gshield 1 {SelectedItem:{id:minecraft:gold_ingot,tag:{display:{Name:\\\"Gold Shield\\\"}}}}\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"/effect @a[score_Dshield_min=1] 2 3 7\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"/scoreboard players set @a Sshield 1 {SelectedItem:{id:minecraft:stone,tag:{display:{Name:\\\"Stone Shield\\\"}}}}\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1}",id:"Control"},id:"FallingSand",Block:"command_block",Time:1},TileEntityData:{Command:"/summon FallingSand ~1 ~1 ~3 {Riding:{Riding:{Riding:{TileEntityData:{Command:\"/fill ~-1 ~ ~ ~-1 ~3 ~7 redstone_block\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"/effect @a[score_Dshield_min=1] 11 3 3\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"/effect @a[score_Ishield_min=1] 11 3 2\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"/effect @a[score_Ishield_min=1] 2 3 1\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1}",id:"Control"},id:"FallingSand",Block:"command_block",Time:1},TileEntityData:{Command:"/summon FallingSand ~-1 ~0 ~4 {Riding:{Riding:{Riding:{TileEntityData:{Command:\"/effect @a[score_Gshield_min=1] 11 3 2\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"/effect @a[score_Wshield_min=1] 11 3\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"/effect @a[score_Sshield_min=1] 11 3 1\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1}",id:"Control"},id:"FallingSand",Block:"command_block",Time:1},TileEntityData:{Command:"/summon FallingSand ~1 ~-1 ~4 {Riding:{Riding:{Riding:{TileEntityData:{Command:\"/scoreboard players set @a Wshield 1 {SelectedItem:{id:minecraft:planks,tag:{display:{Name:\\\"Wooden Shield\\\"}}}}\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"/scoreboard players set @a Gshield 1 {SelectedItem:{id:minecraft:gold_ingot,tag:{display:{Name:\\\"Gold Shield\\\"}}}}\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"/scoreboard players set @a shield 0\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1}",id:"Control"},id:"FallingSand",Block:"command_block",Time:1},TileEntityData:{Command:"/summon FallingSand ~-1 ~-2 ~5 {Riding:{Riding:{Riding:{TileEntityData:{Command:\"/give @p[score_shield_min=1] minecraft:gold_ingot 1 0 {display:{Name:\\\"Gold Shield\\\"}}\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"scoreboard players set @a Sshield 0\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"/give @p[score_shield_min=1] minecraft:stone 1 0 {display:{Name:\\\"Stone Shield\\\"}}\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"scoreboard players set @a Gshield 0\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1}",id:"Control"},id:"FallingSand",Block:"command_block",Time:1},TileEntityData:{Command:"/summon FallingSand ~1 ~-3 ~5 {Riding:{Riding:{Riding:{TileEntityData:{Command:\"/give @p[score_shield_min=1] minecraft:iron_ingot 1 0 {display:{Name:\\\"Iron Shield\\\"}}\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"scoreboard players set @a Dshield 0\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"/give @p[score_shield_min=1] minecraft:diamond 1 0 {display:{Name:\\\"Diamond Shield\\\"}}\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"/scoreboard players set @a Dshield 1 {SelectedItem:{id:minecraft:diamond,tag:{display:{Name:\\\"Diamond Shield\\\"}}}}\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1}",id:"Control"},id:"FallingSand",Block:"command_block",Time:1},TileEntityData:{Command:"/summon FallingSand ~-1 ~-4 ~6 {Riding:{Riding:{TileEntityData:{Command:\"/give @p[score_shield_min=1] minecraft:planks 1 0 {display:{Name:\\\"Wooden Shield\\\"}}\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"scoreboard players set @a Ishield 0\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1}",id:"Control"},id:"FallingSand",Block:"command_block",Time:1},TileEntityData:{Command:"/summon FallingSand ~1 ~-5 ~6 {Riding:{Riding:{TileEntityData:{Command:\"scoreboard players set @a Wshield 0\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"/scoreboard players set @a Ishield 1 {SelectedItem:{id:minecraft:iron_ingot,tag:{display:{Name:\\\"Iron Shield\\\"}}}}\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1},TileEntityData:{Command:\"/scoreboard players set @a shield 0\",id:\"Control\"},id:\"FallingSand\",Block:\"command_block\",Time:1}",id:"Control"},id:"FallingSand",Block:"command_block",Time:1},TileEntityData:{Command:"/summon FallingSand ~ ~-12 ~3 {id:\"FallingSand\",Block:\"redstone_block\",Time:1}",id:"Control"},id:"FallingSand",Block:"command_block",Time:1},TileEntityData:{Command:"/setblock ~ ~-14 ~1 wall_sign 2 0 {Text2:\"{\\\"clickEvent\\\":{\\\"action\\\":\\\"run_command\\\",\\\"value\\\":\\\"/scoreboard players set @p shield 1\\\"},\\\"text\\\":\\\"[Get Shields]\\\"}\",Text3:\"{\\\"color\\\":\\\"blue\\\",\\\"text\\\":\\\"Command by\\\"}\",Text1:\"{\\\"color\\\":\\\"dark_green\\\",\\\"text\\\":\\\"Vanilla Shields\\\"}\",Text4:\"{\\\"color\\\":\\\"blue\\\",\\\"text\\\":\\\"McTsts\\\"}\",y:22,x:-579,z:120,id:\"Sign\"}",id:"Control"},id:"FallingSand",Block:"command_block",Time:1},TileEntityData:{Command:"/fill ~ ~-17 ~ ~-1 ~2 ~ air",id:"Control"},id:"FallingSand",Block:"command_block",Time:1},TileEntityData:{Command:"/fill ~-1 ~-18 ~ ~-1 ~-1 ~ redstone_block",id:"Control"},id:"FallingSand",Block:"command_block",Time:1},id:"FallingSand",Block:"redstone_block",Time:1}