Complex sentence: In July 2003, stating that dwindling sponsorship revenue had forced them to cut the number of tournament referees from ten to eight, the World Snooker Association terminated the contracts of Tabb and Dutch referee Johan Oomen on a "last in, first out" basis.
Split into simpler sentences: In July 2003, Tabb's career was threatened when the World Snooker Association, citing dwindling sponsorship revenue, decided to cut the number of tournament referees from ten to eight. The WSA terminated the contracts of Tabb and Dutch referee Johan Oomen on a "last in, first out" basis.