Complex sentence: Supported by original engine authors and based on voluntarism and donation, it caused a furor in February 2011, when the free version of Houdini defeated reigning computer chess champion Rybka in a 40-game match.
Split into simpler sentences: Supported by original engine authors and based on voluntarism and donation. It caused a furor in February 2011, when the free version of Houdini defeated reigning computer chess champion Rybka in a 40-game match.