Turning list elements into a single string

Question

I have a list of lists in this form:

[[\'3\', \',\', \'1\', \',\', \'0\', \',\', \'2\', \',\', \'0\'], [\'2\', \',\', \'1\', \',\', \'0\', \',\', \'0\', \',\', \'0\']