Complex sentence: British developer Ed Key began work on "Proteus" in 2008 during evenings and weekends, with the game only nearing its final form when David Kanaga joined development in 2010.
Split into simpler sentences: British developer Ed Key began work on "Proteus" in 2008 during his evenings and weekends. The game only neared its final form when David Kanaga joined development in 2010.