Complex sentence: Chief among these was the Ascot Gold Cup in 1936, when she beat the American horse Omaha by a short head after a tremendous battle, she she also won The Oaks-having started at 33-1-the Ormonde STakes and Jockey Club Cup.
Split into simpler sentences: Chief among these was the Ascot Gold Cup in 1936, when she beat the American horse Omaha by a short head after a tremendous battle. She also won The Oaks-having started at 33-1-the Ormonde STakes and Jockey Club Cup.