Complex sentence: Encke (24 February 2009--14 October 2014) was an American-bred, British-trained Thoroughbred racehorse, best known for winning the classic St Leger Stakes at Doncaster Racecourse on 15 September 2012 when he defeated the Triple Crown bid of Camelot.
Split into simpler sentences: Encke (24 February 2009--14 October 2014) was an American-bred, British-trained Thoroughbred racehorse. He is best known for winning the classic St Leger Stakes at Doncaster Racecourse on 15 September 2012 when he defeated the Triple Crown bid of Camelot.