Sniper-Bow with Only One Command

summon falling_block ~ ~1 ~ {Block:stone,Time:1,Passengers:[{id:falling_block,Block:redstone_block,Time:1,Passengers:[{id:falling_block,Block:activator_rail,Time:1,Passengers:[{id:commandblock_minecart,Command:"gamerule commandBlockOutput false"},{id:commandblock_minecart,Command:"fill ~-1 ~-3 ~-2 ~2 ~-1 ~-8 stained_hardened_clay 12 hollow"},{id:commandblock_minecart,Command:"fill ~-1 ~-2 ~-2 ~2 ~-2 ~-8 stained_glass 0 0 stained_hardened_clay"},{id:commandblock_minecart,Command:" scoreboard objectives add inhand dummy"},{id:commandblock_minecart,Command:" tellraw @a {\"text\":[\"\"]}"},{id:commandblock_minecart,Command:" tellraw @a {\"text\":[\"\"]}"},{id:commandblock_minecart,Command:" tellraw @a {\"text\":[\"\"]}"},{id:commandblock_minecart,Command:" tellraw @a {\"text\":[\"\"]}"},{id:commandblock_minecart,Command:" tellraw @a [\"\",{\"text\":\"Check out my \"},{\"text\":\"YT-Channel \",\"color\":\"dark_red\"},{\"text\":\"right -> \",\"color\":\"none\"},{\"text\":\"HERE\",\"color\":\"green\",\"bold\":true,\"underlined\":true,\"clickEvent\":{\"action\":\"open_url\",\"value\":\"https://www.YouTube.com/TheCreativeSimon\"}}]"},{id:commandblock_minecart,Command:" tellraw @a {\"text\":[\"\"]}"},{id:commandblock_minecart,Command:" tellraw @a {\"text\":[\"\"]}"},{id:commandblock_minecart,Command:" tellraw @a {\"text\":[\"\"]}"},{id:commandblock_minecart,Command:" tellraw @a {\"text\":[\"\"]}"},{id:commandblock_minecart,Command:" tellraw @a {\"text\":[\"\"]}"},{id:commandblock_minecart,Command:" title @a times 20 60 20"},{id:commandblock_minecart,Command:" title @a subtitle {\"text\":\"by Creative Simon\",\"color\":\"dark_red\"}"},{id:commandblock_minecart,Command:" title @a title {\"text\":\"Sniper-Bow\",\"color\":\"aqua\"}"},{id:commandblock_minecart,Command:"setblock ~ ~-3 ~-1 wall_sign 3 0 {Text1:\"{\\\"text\\\":\\\"============\\\"}\",Text2:\"{\\\"text\\\":\\\"Click here to destroy\\\"}\",Text3:\"{\\\"text\\\":\\\"this machine\\\"}\",Text4:\"{\\\"text\\\":\\\"============\\\",\\\"clickEvent\\\":{\\\"action\\\":\\\"run_command\\\",\\\"value\\\":\\\"fill ~-2 ~ ~-7 ~2 ~2 ~-1 air\\\"}}\"}"},{id:commandblock_minecart,Command:"setblock ~ ~-2 ~-1 wall_sign 3 0 {Text1:\"{\\\"text\\\":\\\"\\\",\\\"clickEvent\\\":{\\\"action\\\":\\\"run_command\\\",\\\"value\\\":\\\"/give @p bow 1 0 {display:{Name:\\\\\\\\\\\\\\\"Sniper\\\\\\\\\\\\\\\"}}\\\"}}\",Text2:\"{\\\"text\\\":\\\"Sniper Bow\\\",\\\"color\\\":\\\"dark_blue\\\",\\\"clickEvent\\\":{\\\"action\\\":\\\"run_command\\\",\\\"value\\\":\\\"/give @p bow 1 0 {display:{Name:\\\\\\\\\\\\\\\"Z-Sniper\\\\\\\\\\\\\\\"}}\\\"},\\\"italic\\\":true}\",Text3:\"{\\\"text\\\":\\\"by Creative Simon\\\",\\\"color\\\":\\\"dark_red\\\"}\",Text4:\"{\\\"text\\\":\\\"\\\"}\"}"},{id:commandblock_minecart,Command:"fill ~ ~-2 ~-7 ~1 ~-2 ~-3 chain_command_block 2"},{id:commandblock_minecart,Command:"setblock ~1 ~-2 ~-7 chain_command_block 3"},{id:commandblock_minecart,Command:"setblock ~ ~-2 ~-7 chain_command_block 5"},{id:commandblock_minecart,Command:"setblock ~ ~-2 ~-3 repeating_command_block 2"},{id:commandblock_minecart,Command:"blockdata ~1 ~-2 ~-7 {auto:1,Command:\"execute @a[score_inhand_min=2,score_inhand=2] ~ ~ ~ entitydata @e[type=Arrow,r=2,c=1] {NoGravity:1b}\"}"},{id:commandblock_minecart,Command:"blockdata ~ ~-2 ~-7 {auto:1,Command:\"execute @a[score_inhand_min=2,score_inhand=2] ~ ~ ~ effect @s slowness 1 255 true\"}"},{id:commandblock_minecart,Command:"blockdata ~ ~-2 ~-6 {auto:1,Command:\"execute @a[score_inhand_min=1,score_inhand=1] ~ ~ ~ entitydata @e[type=Arrow,r=2,c=1] {NoGravity:1b}\"}"},{id:commandblock_minecart,Command:"blockdata ~ ~-2 ~-5 {auto:1,Command:\"scoreboard players set @a inhand 2 {SelectedItem:{id:\\\"minecraft:bow\\\",tag:{display:{Name:\\\"Z-Sniper\\\"}}}}\"}"},{id:commandblock_minecart,Command:"blockdata ~ ~-2 ~-4 {auto:1,Command:\"scoreboard players set @a inhand 1 {SelectedItem:{id:\\\"minecraft:bow\\\",tag:{display:{Name:\\\"Sniper\\\"}}}}\"}"},{id:commandblock_minecart,Command:"blockdata ~ ~-2 ~-3 {auto:1,Command:\"scoreboard players set @a inhand 0\"}"},{id:commandblock_minecart,Command:"setblock ~ ~ ~1 command_block 0 0 {Command:\"fill ~ ~-3 ~-1 ~ ~ ~ air\"}"},{id:commandblock_minecart,Command:"setblock ~ ~-1 ~1 redstone_block"},{id:commandblock_minecart,Command:"kill @e[type=commandblock_minecart,r=1]"}]}]}]}