Complex sentence: Lord Pretender's great passion outside of music was horse racing, and he could frequently be observed at Trinidad's Santa Rosa Park racecourse with his friend Lord Kitchener, a fellow calypsonian and horse-owner.
Split into simpler sentences: Lord Pretender's great passion outside of music was horse racing. He could frequently be observed at Trinidad's Santa Rosa Park racecourse with his friend Lord Kitchener, a fellow calypsonian and horse-owner.