Complex sentence: In October 1765, the Bay Malton raced Gimcrack, the most famous racehorse of his day and beat him'very easy', winning Rockingham 9,000 guineas.
Split into simpler sentences: In October 1765, the Bay Malton raced Gimcrack, the most famous racehorse of the day. The Bay Malton beat Gimcrack'very easy', winning Rockingham 9,000 guineas.