Complex sentence: Originally intended to be a standalone title, its story was changed during production into a sequel to the 1994 PC game "System Shock"; the alterations were made when Electronic Arts--who owned the "System Shock" franchise rights--signed on as publisher.
Split into simpler sentences: Originally intended to be a standalone title, its story was changed during production into a sequel to the 1994 PC game "System Shock". The alterations were made when Electronic Arts--who owned the "System Shock" franchise rights--signed on as publisher.