Complex sentence: The Mill Reef Stakes is a Group 2 flat horse race in the United Kingdom for two-year-old thoroughbreds run over a distance of 6 furlongs and 8 yards (1,214 metres) at Newbury Racecourse in September.
Split into simpler sentences: The Mill Reef Stakes is a Group 2 flat horse race in the United Kingdom for two-year-old thoroughbreds. It is run over a distance of 6 furlongs and 8 yards (1,214 metres) at Newbury Racecourse in September.