Complex sentence: The Queen Elizabeth II Stakes is a Group 1 flat horse race in the United Kingdom for three-year-old and above thoroughbreds run over a distance of 1 mile at Ascot Racecourse in late September.
Split into simpler sentences: The Queen Elizabeth II Stakes is a Group 1 flat horse race in the United Kingdom for three-year-old and above thoroughbreds. It is run over a distance of 1 mile at Ascot Racecourse in late September.