Complex sentence: On July 16,2008, NCsoft merged the two games' content together, thus a player who only owned "City of Heroes" could now play "City of Villains", and vice versa.
Split into simpler sentences: On July 16,2008, NCsoft merged the two games' content together. Thus, a player who only owned "City of Heroes" could now play "City of Villains", and vice versa.