Complex sentence: He also worked on the Game Boy Advance versions of "Commander Keen" (2001), "Wolfenstein 3D", and "Doom II", and was project manager on "Doom 3" until he moved to Ensemble in August 2003.
Split into simpler sentences: He also worked on the Game Boy Advance versions of "Commander Keen" (2001), "Wolfenstein 3D", and "Doom II". He most recently worked as the project manager on "Doom 3" until he moved to Ensemble in August 2003.