Complex sentence: The St. Simon Stakes is a Group 3 flat horse race in the United Kingdom for three-year-old and above thoroughbreds run over a distance of 1 mile 4 furlongs and 5 yards (2,419 metres) at Newbury Racecourse in late October.
Split into simpler sentences: The St. Simon Stakes is a Group 3 flat horse race in the United Kingdom for three-year-old and above thoroughbreds. It is run over a distance of 1 mile 4 furlongs and 5 yards (2,419 metres) at Newbury Racecourse in late October.