Complex sentence: It has been alleged that Giancana was responsible for suggesting he take a position inside the Chicago Police Department during the mid 1950s where he served as a bagman between corrupt police officials and the Outfit.
Split into simpler sentences: It has been alleged that Giancana was responsible for arranging for him to take a position inside the Chicago Police Department during the mid 1950s. While a policeman, Cain served as a bagman between corrupt police officials and the Outfit.