Complex sentence: Joe's best friend, truck-driveer (and later police officer) Vinny Wolek, fell in love with Niki, but when he realized she was really a split-personality (or' alter') of Viki, he told Joe the truth.
Split into simpler sentences: Joe's best friend, truck-driver (and later police officer) Vinny Wolek, fell in love with Niki. When he realized she was really a split-personality (or' alter') of Viki, he told Joe the truth.