Mob Conversion Remove

summon falling_block ~ ~1.5 ~ {Motion:[0.0,-1.0,0.0],Time:1,DropItem:0,Block:redstone_block,Passengers:[
{id:"falling_block",Time:1,DropItem:0,Block:activator_rail},
{id:"commandblock_minecart",Command:"execute @e[type=armor_stand,tag=2.0,name=GM4_mobConversion] ~ ~ ~ setblock ~ ~ ~ minecraft:command_block 0 replace {Command:\"fill ~-1 ~ ~ ~15 ~1 ~1 air\"}"},
{id:"commandblock_minecart",Command:"kill @e[type=armor_stand,tag=2.0,name=GM4_mobConversion]"},
{id:"commandblock_minecart",Command:"scoreboard objectives remove GM4_Conversion"},
{id:"commandblock_minecart",Command:"kill @e[type=commandblock_minecart,r=1]"}]}