Complex sentence: The Irish St Leger is a Group 1 flat horse race in the Republic of Ireland for three-year-old and above thoroughbreds run over a distance of 1 mile and 6 furlongs (2,816 metres) at the Curragh in September.
Split into simpler sentences: The Irish St Leger is a Group 1 flat horse race in the Republic of Ireland for three-year-old and above thoroughbreds. It is run over a distance of 1 mile and 6 furlongs (2,816 metres) at the Curragh in September.