Complex sentence: Hickman's office has previously been involved in its own fair share of serious scandals, both as sheriff and as Precinct 4 constable, including having both Goforth involved with a mistress and then a deputy homicide investigator have sex with the same mistress.
Split into simpler sentences: Hickman's office, both as sheriff and as Precinct 4 constable, has previously been involved in its own fair share of serious scandals. The scandals included having both Goforth and then a deputy homicide investigator have sex with the same mistress.