Original sentence: O'Brien is backed by the Coolmore operation.The Coolmore operation is renowned for high priced yearling purchases at the Keeneland September Yearling Sales and elsewhere
Edited sentence: O'Brien is backed by the Coolmore operation, which undoubtedly gives him a huge advantage.The Coolmore operation is renowned for high priced yearling purchases at the Keeneland September Yearling Sales, and elsewhere, and more often than not the best of these will come under Aidan's guidance at Ballydoyle