Complex sentence: The Summer Mile Stakes is a Group 2 flat horse race in the United Kingdom for four-year-old and above thoroughbreds run over a distance of 1 mile at Ascot Racecourse in July.
Split into simpler sentences: The Summer Mile Stakes is a Group 2 flat horse race in the United Kingdom for four-year-old and above thoroughbreds. It is run over a distance of 1 mile at Ascot Racecourse in July.