Complex sentence: The Oak Tree Stakes is a Group 3 flat horse race in the United Kingdom for thoroughbred fillies and mares run over a distance of 7 furlongs (1,408 metres) at Goodwood Racecourse during the Glorious Goodwood meeting in late July/early August.
Split into simpler sentences: The Oak Tree Stakes is a Group 3 flat horse race in the United Kingdom for thoroughbred fillies and mares. It is run over a distance of 7 furlongs (1,408 metres) at Goodwood Racecourse during the Glorious Goodwood meeting in late July or early August.