Complex sentence: He also became the grandsire of 1991 Canadian Triple Crown winner Dance Smartly, which became the richest filly at that time with 12 wins from 17 career starts, including the 1991 Breeders' Cup Distaff and over $2 million.
Split into simpler sentences: He also became the grandsire of 1991 Canadian Triple Crown winner Dance Smartly. She became the richest filly at that time with 12 wins from 17 career starts, including the 1991 Breeders' Cup Distaff, and purses of more than $2 million.