Data tag parsing failed

I have a command that is in a block;

/summon FallingSand ~ ~1 ~ {Block:redstone_block,Time:1,Riding:{id:"FallingSand",Block:command_block,TileEntityData:

{Command:"/fill ~ ~0 ~1 ~ ~-5 ~1 redstone_block"}

,Time:1,Riding:{id:"FallingSand",Block:command_block,TileEntityData:

{Command:setblock ~ ~3 ~1 stone}

,Time:1,Riding:{id:"FallingSand",Block:command_block,TileEntityData:{Command:setblock ~ ~4 ~ command_block 0 replace {Command:fill ~ ~2 ~ ~ ~-8 ~1 air}},Time:1,Riding:{id:"FallingSand",Block:command_block,TileEntityData:

{Command:"/fill ~-2 ~-1 ~-8 ~2 ~ ~-4 minecraft:leaves"}

,Time:1,Riding:{id:"FallingSand",Block:command_block,TileEntityData:

{Command:"/fill ~-1 ~2 ~-7 ~1 ~3 ~-5 minecraft:leaves"}

,Time:1,Riding:{id:"FallingSand",Block:command_block,TileEntityData:

{Command:"/fill ~ ~-2 ~-6 ~ ~3 ~-6 minecraft:log"}

, Time:1,Riding:{id:"FallingSand",Block:stone,Time:1}}}}}}}}

but when I turn it into stone and then replace it with a setblock command which is;

/setblock ~1 ~-4 ~2 minecraft:command_block 0 destroy {Command:"/summon FallingSand ~ ~1 ~ {Block:redstone_block,Time:1,Riding:{id:"FallingSand",Block:command_block,TileEntityData:

{Command:"/fill ~ ~0 ~1 ~ ~-5 ~1 redstone_block"}

,Time:1,Riding:{id:"FallingSand",Block:command_block,TileEntityData:

{Command:setblock ~ ~3 ~1 stone}

,Time:1,Riding:{id:"FallingSand",Block:command_block,TileEntityData:{Command:setblock ~ ~4 ~ command_block 0 replace {Command:fill ~ ~2 ~ ~ ~-8 ~1 air}},Time:1,Riding:{id:"FallingSand",Block:command_block,TileEntityData:

{Command:"/fill ~-2 ~-1 ~-8 ~2 ~ ~-4 minecraft:leaves"}

,Time:1,Riding:{id:"FallingSand",Block:command_block,TileEntityData:

{Command:"/fill ~-1 ~2 ~-7 ~1 ~3 ~-5 minecraft:leaves"}

,Time:1,Riding:{id:"FallingSand",Block:command_block,TileEntityData:

{Command:"/fill ~ ~-2 ~-6 ~ ~3 ~-6 minecraft:log"}

, Time:1,Riding:{id:"FallingSand",Block:stone,Time:1}}}}}}}}"}

All I get is an error;

Data tag parsing failed:Unexpexted token 'F' at: FallingSand",Block:command_block, etc... (By the way, this is the fill with redstone blocks command or easier said, the first command_block)