Complex sentence: In February 2007 she became the first woman to referee the final of a world-ranking professional snooker tournament, and in May 2009 she became the first woman to referee a World Snooker Championship final.
Split into simpler sentences: In February 2007 she became the first woman to referee the final of a world-ranking professional snooker tournament. In May 2009 she became the first woman to referee a World Snooker Championship final.