What is the version of the following sentence with correct punctuation?

This device of advancing under cover which is still basic in Communism today was the guiding principle If only the aim is achieved it does not matter under what cover it takes place and a cover is always necessary
This device of advancing "under cover" (which is still basic in Communism today) was the guiding principle: "If only the aim is achieved, it does not matter under what cover it takes place; and a cover is always necessary.