Complex sentence: Landreth received offers to produce feature films, but rejected them to create another animated short film, "The Spine", which was released in 2009 and used the same production team and psychological realism technique that was used in "Ryan".
Split into simpler sentences: Landreth received offers to produce feature films, but rejected them to create another animated short film. This became "The Spine", which was released in 2009 and used the same production team and psychological realism technique that was used in "Ryan".