Complex sentence: Casamento made his racecourse debut in a maiden race over seven and a half furlongs at Tipperary Racecourse on 28 August in which he was ridden by Gary Carroll who was able to claim a three pound weight allowance as he had ridden less than 95 winners.
Split into simpler sentences: Casamento made his racecourse debut in a maiden race over seven and a half furlongs at Tipperary Racecourse on 28 August. He was ridden by Gary Carroll who was able to claim a three pound weight allowance as he had ridden less than 95 winners.