Complex sentence: Sometime between 1893 and 1900 the racing moved to Vauxhall Fields where racing ended in 1933 for unknown reasons ending almost 200 years of racing in Monmouth.
Split into simpler sentences: Sometime between 1893 and 1900 the racing moved to Vauxhall Fields where racing ended in 1933 for unknown reasons. This ending almost 200 years of racing in Monmouth.