Complex sentence: The Queen Mary Stakes is a Group 2 flat horse race in the United Kingdom for two-year-old thoroughbred fillies run over a distance of 5 furlongs (1,006 metres) at Ascot Racecourse during the Royal Ascot meeting in June.
Split into simpler sentences: The Queen Mary Stakes is a Group 2 flat horse race in the United Kingdom for two-year-old thoroughbred fillies. It is run over a distance of 5 furlongs (1,006 metres) at Ascot Racecourse during the Royal Ascot meeting in June.