Complex sentence: Tszvetana Pironkova (born 13 September 1987, Bulgaria) is a female Bulgarian tennis player who made headlines by defeating tenth-seed Venus Williams in the first round of the 2006 Australian Open, when Pironkova was rated 94th in the world.
Split into simpler sentences: Tszvetana Pironkova (born 13 September 1987) is a female Bulgarian tennis player. She made headlines by defeating tenth-seed Venus Williams in the first round of the 2006 Australian Open, when Pironkova was ranked 94th in the world.