Complex sentence: The September 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 and 4 furlongs (2,414 metres) at Kempton Park Racecourse in early September.
Split into simpler sentences: The September 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 and 4 furlongs (2,414 metres) at Kempton Park Racecourse in early September.