Complex sentence: Zenyatta also broke the All-time Breeders Cup earnings record (set by Tiznow in 2001) with earnings in excess of $4,650,000.
Split into simpler sentences: Zenyatta also broke the All-time Breeders Cup earnings record set by Tiznow in 2001. Zenyatta ended of career with Breeders Cup earnings in excess of $4,650,000.