Walking Dead in MC

summon FallingSand ~ ~1.5 ~ {Motion:[0.0,-1.0,0.0],Time:1,DropItem:0,Block:redstone_block,Passengers:[{id:FallingSand,Time:1,DropItem:0,Block:activator_rail},{id:MinecartCommandBlock,Command:setblock ~2 ~-2 ~ command_block 5 _ {TrackOutput:0b,Command:summon FallingSand ~ ~0.5 ~ {Block:redstone_block,Motion:[0.0,0.35,0.0]}}},{id:MinecartCommandBlock,Command:setblock ~3 ~-2 ~ chain_command_block 5 _ {auto:1,TrackOutput:0b,Command:scoreboard objectives add GM4_zombified stat.entityKilledBy.Zombie}},{id:MinecartCommandBlock,Command:setblock ~4 ~-2 ~ chain_command_block 5 _ {auto:1,TrackOutput:0b,Command:execute @a[score_GM4_zombified_min=1,m=!3] ~ ~ ~ summon Zombie ~ ~1 ~ {CustomName:Undead Player,CustomNameVisible:1,CanPickUpLoot:1,PersistenceRequired:1,IsBaby:0,HandItems:{},ArmorItems:{},Tags:["GM4_UndeadZombie"]}}},{id:MinecartCommandBlock,Command:setblock ~5 ~-2 ~ chain_command_block 5 _ {auto:1,TrackOutput:0b,Command:/scoreboard players reset @a[score_GM4_zombified_min=1] GM4_zombified}},{id:MinecartCommandBlock,Command:setblock ~1 ~-2 ~ wall_sign 4},{id:MinecartCommandBlock,Command:"blockdata ~1 ~-2 ~ {Text1:\"{\\\"text\\\":\\\"Undead Players\\\"}\",Text2:\"{\\\"text\\\":\\\"Only Zombies\\\",\\\"clickEvent\\\":{\\\"action\\\":\\\"run_command\\\",\\\"value\\\":\\\"/tellraw @p [{\\\\\\\"text\\\\\\\":\\\\\\\"[GM4] Undead Players Only Zombies V2.0 Click for Commands, Updates & Info\\\\\\\",\\\\\\\"color\\\\\\\":\\\\\\\"aqua\\\\\\\",\\\\\\\"clickEvent\\\\\\\":{\\\\\\\"action\\\\\\\":\\\\\\\"open_url\\\\\\\",\\\\\\\"value\\\\\\\":\\\\\\\"http://gm4.co/v/?5,2.0\\\\\\\"}}]\\\"}}\",Text3:\"{\\\"text\\\":\\\"Click For Info\\\"}\"}"},{id:MinecartCommandBlock,Command:summon ArmorStand ~2 ~-1.9 ~ {CustomName:GM4_undeadPlayersOnlyZombies,Tags:["2.0",GM4],NoGravity:1}},{id:MinecartCommandBlock,Command:setblock ~2 ~-1 ~ redstone_block},{id:MinecartCommandBlock,Command:kill @e[type=MinecartCommandBlock,r=1]}]}