Complex sentence: He is also the only biathlete who has won every single event during the same Winter Olympic Games, in Salt Lake City 2002, and just the third Olympian to win four gold medals during the same Winter Games.
Split into simpler sentences: He is also the only biathlete who has won every single event during the same Winter Olympic Games. He achieved this feat at the Salt Lake City 2002 Winter Olympics, this makes him one of only three Olympians who have won four gold medals during the same Winter Games.