Complex sentence: The Autumn Stakes is a Group 3 flat horse race in the United Kingdom for two-year-old thoroughbreds run over a distance of 1 mile (1,609 metres) at Ascot Racecourse in October.
Split into simpler sentences: The Autumn Stakes is a Group 3 flat horse race in the United Kingdom for two-year-old thoroughbreds. It is run over a distance of 1 mile (1,609 metres) at Ascot Racecourse in October.