sentence: To try to keep the environment clean , we have a big group of voluntary workers that work after their jobs here trying to keep this area as clean as possible by picking up all the rubbish and checking the whole area in case there is something not normal .
modified: To try to keep the environment clean we have a big group of voluntary workers that work after their jobs here trying to keep this area as clean as possible by picking all the rubbish and controlling the whole area in case there is something not normal .
transformation: PUNCT, PART, VERB