echo a loop with variables command

echo a loop with variables command

I have several lists and want to run some commands over them. As lists are long I want to run those commands parallel to each other, hence using nohup.
For every item I tried to echo a loop that contains a nohup command, but it doesn't work.
How can I set those nohup commands running in parallel?
for a in $(cat list_of_names)
      do             
          ID=`echo $a`
          mkdir ${ID}
          echo "
             nohup sh -c '
             for b in $(cat another_list_of_names)
               do
                  ./tools $b $a > ${ID}/
               done' &
           "

      done