Complex sentence: In 2007, she became the first female referee to take charge of a world-ranking snooker final, and in May 2009 was the first woman to referee the World Snooker Championship final--the sport's highest refereeing honour.
Split into simpler sentences: In 2007, she became the first woman to officiate at a world-ranking snooker final. In May 2009 she became the first woman to referee a World Snooker Championship final, the sport's highest refereeing honour.