Complex sentence: The Summer Stakes is a Group 3 flat horse race in the United Kingdom for three-year-old and above thoroughbred fillies run over a distance of 6 furlongs (1,207 metres) at York Racecourse in July.
Split into simpler sentences: The Summer Stakes is a Group 3 flat horse race in the United Kingdom for three-year-old and above thoroughbred fillies. It is run over a distance of 6 furlongs (1,207 metres) at York Racecourse in July.