Complex sentence: In 2003 Khanty-Mansiysk was the venue of Biathlon World Championships, and in 2011 these competitions will be held again; besides, the World Chess Olympiad will take place in Khanty-Mansiysk in 2010.
Split into simpler sentences: In 2003 Khanty-Mansiysk was the venue of Biathlon World Championships, and in 2011 these competitions will be held again. The World Chess Olympiad took place in Khanty-Mansiysk in 2010.