Complex sentence: At Newmarket the colt started 4/5 favourite for the £10,000 Princess of Wales's Stakes over one mile on 5 July, for which as the Derby winner, he had to carry a weight penalty.
Split into simpler sentences: At Newmarket the Derby winner started 4/5 favourite for the £10,000 Princess of Wales's Stakes over one mile on 5 July. As the Derby winner he had to carry a weight penalty.