Complex sentence: The Randwick Guineas is an Australian Turf Club Group One Thoroughbred horse race for three-year-olds, run at set weights over a distance of 1600 metres at Randwick Racecourse in Sydney, Australia in March as a part of the Sydney Autumn Carnival.
Split into simpler sentences: The Randwick Guineas is a Group One Thoroughbred horse race for three-year-olds, run at set weights over a distance of 1600 metres at Randwick Racecourse in Sydney, Australia. It is held in March as a part of the Sydney Autumn Carnival.