Use this base to make complex commands of your own!
Copy the whole segment from Curly Bracket ( { ) to Comma ( , ) and paste it after a previous comma!
It should look something like this;
{id:MinecartCommandBlock,Command:""}, {id:MinecartCommandBlock,Command:""},
Then hit Enter after the previous comma for organization purposes.
Don't worry, hitting enter does not effect the command what so ever!
Enjoy!
-xxstevezz