Complex sentence: Unbeknownst to the happy two, Zoltan the magician was into black magic and had summoned an evil demon which possessed him and made him murder his wives in grotesque ways remotely connected to their enjoyed hobby or career.
Split into simpler sentences: Unbeknownst to the happy two, Zoltan the magician was into black magic and had summoned an evil demon which possessed him and made him murder his wives. Zoltan murderd his wives in grotesque ways remotely connected to their enjoyed hobby or career.