Minecart Fireflys 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 ~-2 ~-3 ~1 ~-5 ~-1 ~-1 stained_hardened_clay 4 hollow},{id:commandblock_minecart,Command:fill ~-2 ~-2 ~1 ~-5 ~-2 ~-1 stained_glass 0 0 stained_hardened_clay},{id:commandblock_minecart,Command:setblock ~-1 ~-3 ~ wall_sign 5 0 {Text1:"{\\\"text\\\":\\\"\\\",\\\"clickEvent\\\":{\\\"action\\\":\\\"run_command\\\",\\\"value\\\":\\\"/give @p spawn_egg 1 65 {display:{Name:\\\\\\\"Spawn-Firefly\\\\\\\"},EntityTag:{id:\\\\\\\"minecraft:bat\\\\\\\"}}\\\"}}",Text2:"{\\\"text\\\":\\\"Get\\\"}",Text3:"{\\\"text\\\":\\\"Firefly Spawnegg\\\",\\\"color\\\":\\\"dark_blue\\\",\\\"underlined\\\":true}",Text4:"{\\\"text\\\":\\\"\\\"}"}},{id:commandblock_minecart,Command:setblock ~-1 ~-2 ~ wall_sign 5 0 {Text1:"{\\\"text\\\":\\\"\\\"}",Text2:"{\\\"text\\\":\\\"Fireflys\\\",\\\"color\\\":\\\"dark_blue\\\",\\\"italic\\\":true}",Text3:"{\\\"text\\\":\\\"by TCSimon\\\",\\\"color\\\":\\\"dark_red\\\"}",Text4:"{\\\"text\\\":\\\"\\\"}"}},{id:commandblock_minecart,Command:setblock ~-1 ~-1 ~ wall_sign 5 0 {Text1:"{\\\"text\\\":\\\"===========\\\",\\\"clickEvent\\\":{\\\"action\\\":\\\"run_command\\\",\\\"value\\\":\\\"/kill @e[tag=firefly]\\\"}}",Text2:"{\\\"text\\\":\\\"Click to DESTROY\\\"}",Text3:"{\\\"text\\\":\\\"this MACHINE\\\"}",Text4:"{\\\"text\\\":\\\"===========\\\",\\\"clickEvent\\\":{\\\"action\\\":\\\"run_command\\\",\\\"value\\\":\\\"fill ~-5 ~-2 ~-1 ~-1 ~ ~1 air\\\"}}"}},{id:commandblock_minecart,Command:fill ~-4 ~-2 ~ ~-3 ~-2 ~ chain_command_block 4},{id:commandblock_minecart,Command:setblock ~-3 ~-2 ~ repeating_command_block 4},{id:commandblock_minecart,Command:blockdata ~-4 ~-2 ~ {auto:1,Command:/execute @e[type=bat,name=Spawn-Firefly] ~ ~ ~ kill @e[type=bat,name=Spawn-Firefly]}},{id:commandblock_minecart,Command:blockdata ~-3 ~-2 ~ {auto:1,Command:"/execute @e[type=bat,name=Spawn-Firefly] ~ ~ ~ summon bat ~ ~8 ~ {Tags:[\\\"firefly\\\"],Silent:1,ActiveEffects:[{Id:14,Amplifier:1,Duration:19999980,ShowParticles:0b}],Passengers:[{id:\\\"xp_orb\\\",Tags:[\\\"firefly\\\"],Value: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]}]}]}]}