Complex sentence: The estate was purchased in 1903 by the millionaire Solly Joel, well known in horse racing circles, who had a racecourse on the estate, the racecourse was demolished during the first world war and the grandstand was re-erected at Newbury Racecourse.
Split into simpler sentences: The estate was purchased in 1903 by the millionaire Solly Joel, well known in horse racing circles, who had a racecourse on the estate. The racecourse was demolished during the First World War and the grandstand was re-erected at Newbury Racecourse.