Complex sentence: Vermin is not a typical villain in that he is usually a pawn controlled by a super villain and with the intellect of a child would probably never be a threat to anyone were it not for the ease with which he is manipulated.
Split into simpler sentences: Vermin is not a typical villain in that he is usually a pawn controlled by another super villain. He has the intellect of a child, and would probably never be a threat to anyone were it not for the ease with which he is manipulated.