Minecraft Grappling Hook 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 ~3 ~-1 ~-1 ~9 concrete 3 hollow"},{id:commandblock_minecart,Command:"fill ~1 ~-2 ~3 ~-1 ~-2 ~9 stained_glass 0 0 concrete"},{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:"setblock ~ ~-3 ~2 wall_sign 2 0 {Text1:\"{\\\"text\\\":\\\"============\\\"}\",Text2:\"{\\\"text\\\":\\\"Click to destroy\\\"}\",Text3:\"{\\\"text\\\":\\\"this machine\\\"}\",Text4:\"{\\\"text\\\":\\\"============\\\",\\\"clickEvent\\\":{\\\"action\\\":\\\"run_command\\\",\\\"value\\\":\\\"fill ~-2 ~ ~ ~1 ~2 ~7 air\\\"}}\"}"},{id:commandblock_minecart,Command:"setblock ~ ~-2 ~2 wall_sign 2 0 {Text1:\"{\\\"text\\\":\\\"\\\"}\",Text2:\"{\\\"text\\\":\\\"Grappling-Hook\\\",\\\"color\\\":\\\"dark_blue\\\",\\\"italic\\\":true}\",Text3:\"{\\\"text\\\":\\\"by TCSimon\\\",\\\"color\\\":\\\"dark_red\\\"}\",Text4:\"{\\\"text\\\":\\\"\\\"}\"}"},{id:commandblock_minecart,Command:"fill ~ ~-2 ~4 ~ ~-2 ~8 chain_command_block 3"},{id:commandblock_minecart,Command:"setblock ~ ~-2 ~8 chain_command_block 4"},{id:commandblock_minecart,Command:"setblock ~ ~-2 ~4 repeating_command_block 3"},{id:commandblock_minecart,Command:"blockdata ~ ~-2 ~8 {auto:1,Command:\"execute @a[score_inhand_min=1] ~ ~ ~ kill @e[name=unknown,score_inhand_min=1,r=1]\"}"},{id:commandblock_minecart,Command:"blockdata ~ ~-2 ~7 {auto:1,Command:\"execute @a[score_inhand_min=1] ~ ~ ~ tp @p @e[name=unknown,score_inhand_min=1]\"}"},{id:commandblock_minecart,Command:"blockdata ~ ~-2 ~6 {auto:1,Command:\"scoreboard players set @e[name=unknown] inhand 1 {OnGround:1b}\"}"},{id:commandblock_minecart,Command:"blockdata ~ ~-2 ~5 {auto:1,Command:\"scoreboard players set @a inhand 1 {SelectedItem:{id:\\\"minecraft:fishing_rod\\\",tag:{display:{Name:\\\"Grappling-Hook\\\"}}}}\"}"},{id:commandblock_minecart,Command:"blockdata ~ ~-2 ~4 {auto:1,Command:\"scoreboard players set TCSimon 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]"}]}]}]}