Custom Randomly Spawning Sturctures In One Command {Command}

/summon FallingSand ~ ~1 ~ {TileID:137,Time:1,TileEntityData:{auto:1,Command:gamerule commandBlockOutput false},Passengers:[{id:FallingSand,TileID:137,Time:1,TileEntityData:{auto:1,Command:/fill ~4 ~-2 ~1 ~2 ~-2 ~ quartz_block},Passengers:[{id:FallingSand,TileID:137,Time:1,TileEntityData:{auto:1,Command:/fill ~4 ~-2 ~1 ~2 ~-2 ~ barrier},Passengers:[{id:FallingSand,TileID:137,Time:1,TileEntityData:{auto:1,Command:/summon FallingSand ~3 ~1 ~ {TileID:210,Time:1,Data:3,TileEntityData:{auto:1,Command:/spreadplayers ~ ~ 50 500 false @e[name=Structure_Clone]}}},Passengers:[{id:FallingSand,TileID:137,Time:1,TileEntityData:{auto:1,Command:/summon FallingSand ~3 ~1 ~1 {TileID:211,Time:1,Data:5,TileEntityData:{auto:1,Command:/execute @e[name=Structure_Clone] ~ ~ ~ /clone x1 y1 z1 x2 y2 z2 ~ ~ ~ masked normal}}},Passengers:[{id:FallingSand,TileID:137,Time:1,TileEntityData:{auto:1,Command:/scoreboard objectives add SSNSCTime dummy},Passengers:[{id:FallingSand,TileID:137,Time:1,TileEntityData:{auto:1,Command:/summon FallingSand ~4 ~1 ~1 {TileID:211,Time:1,Data:2,TileEntityData:{auto:1,Command:/scoreboard players add @e[name=Structure_Clone] SSNSCTime 1}}},Passengers:[{id:FallingSand,TileID:137,Time:1,TileEntityData:{auto:1,Command:/summon FallingSand ~4 ~1 ~ {TileID:211,Time:1,Data:2,TileEntityData:{auto:1,Command:/kill @e[score_SSNSCTime_min=1]}}},Passengers:[{id:FallingSand,TileID:137,Time:1,TileEntityData:{auto:1,Command:/fill ~2 ~-8 ~ ~2 ~-7 ~ quartz_block},Passengers:[{id:FallingSand,TileID:137,Time:1,TileEntityData:{auto:1,Command:/setblock ~1 ~-9 ~ wall_sign 4 replace {Text1:"{\\"text\\":\\"[Click here]\\",\\"clickEvent\\":{\\"action\\":\\"run_command\\",\\"value\\":\\"summon ArmorStand ~ ~-1 ~ {CustomName:Structure_Clone,Invulnerable:1b,NoGravity:1b,Invisible:1b,CustomNameVisible:1b}\\"},\\"bold\\":true,\\"color\\":\\"dark_green\\"}",Text2:"{\\"text\\":\\"to randomly\\",\\"bold\\":true,\\"color\\":\\"green\\"}",Text3:"{\\"text\\":\\"spawn your\\",\\"bold\\":true,\\"color\\":\\"green\\"}",Text4:"{\\"text\\":\\"structure.\\",\\"bold\\":true,\\"color\\":\\"green\\"}"}},Passengers:[{id:FallingSand,TileID:137,Time:1,TileEntityData:{auto:1,Command:/setblock ~1 ~-9 ~ wall_sign 4 replace {Text1:"{\\"text\\":\\"Custom Random\\",\\"bold\\":true,\\"color\\":\\"dark_aqua\\"}",Text2:"{\\"text\\":\\"Structures In\\",\\"bold\\":true,\\"color\\":\\"dark_aqua\\"}",Text3:"{\\"text\\":\\"One Command\\",\\"bold\\":true,\\"color\\":\\"aqua\\"}",Text4:"{\\"text\\":\\"By SirStickyNote\\",\\"bold\\":false,\\"italic\\":true,\\"color\\":\\"gold\\"}"}},Passengers:[{id:FallingSand,TileID:137,Time:1,TileEntityData:{auto:1,Command:/setblock ~1 ~-12 ~ wall_sign 4 replace {Text1:"{\\"text\\":\\"[Click here]\\",\\"clickEvent\\":{\\"action\\":\\"run_command\\",\\"value\\":\\"/fill ~ ~ ~1 ~3 ~2 ~-1 air 0\\"},\\"bold\\":true,\\"color\\":\\"dark_red\\"}",Text2:"{\\"text\\":\\"to delete\\",\\"bold\\":true,\\"color\\":\\"red\\"}",Text3:"{\\"text\\":\\"this machine\\",\\"bold\\":true,\\"color\\":\\"red\\"}",Text4:"{\\"text\\":\\"\\",\\"bold\\":true,\\"color\\":\\"green\\"}"}},Passengers:[{id:FallingSand,TileID:137,Time:1,TileEntityData:{auto:1,Command:/tellraw @a[r=20] ["",{"text":"You have successfully installed:","color":"yellow"},{"text":" "},{"text":"Randomly Spawning Structure In One Command!","color":"aqua"},{"text":"\\n"},{"text":"To use:","color":"dark_green"},{"text":"\\n"},{"text":"1. Build the structure you want to randomly spawn\\n2. Enter the coordinates of the structure you built into the command block","color":"green"},{"text":"\\n"},{"text":"3. Click the sign that says \\"Click to here to randomly spawn your stucture\\"","color":"green"}]},Passengers:[{id:FallingSand,TileID:137,Time:1,TileEntityData:{auto:1,Command:/fill ~ ~ ~ ~ ~-14 ~ air 0}}]}]}]}]}]}]}]}]}]}]}]}]}]}