Complex sentence: Spungen and Vicious entered a destructive codependent relationship centered around drug use which culminated when Spungen died of a stab wound while staying in the Hotel Chelsea, Manhattan, with Vicious.
Split into simpler sentences: Spungen and Vicious entered a destructive codependent relationship that centered around drug use. This culminated when Spungen died of a stab wound while staying in the Hotel Chelsea, Manhattan, with Vicious.