Complex sentence: Requiem is a video game exclusively for the PlayStation Portable, developed by Rebellion Developments and published by Sierra Entertainment in November 2007 in North America and Europe, and December 2007 in Australia.
Split into simpler sentences: Requiem is a video game exclusive to the PlayStation Portable, developed by Rebellion Developments and published by Sierra Entertainment. It was released in November 2007 in North America and Europe, and December 2007 in Australia.