Complex sentence: The Underwood Stakes is a Melbourne Racing Club Group 1 Thoroughbred horse race, run over 1800 metres under weight-for-age conditions, held at Caulfield Racecourse, Melbourne, Australia in late September each year.
Split into simpler sentences: The Underwood Stakes is a Melbourne Racing Club Group 1 Thoroughbred horse race, held at Caulfield Racecourse in Melbourne Australia. It is run over 1800 metres under weight-for-age conditions in late September each year.