Complex sentence: In 1992, Desormeaux would become the regular rider of Best Pal, who put together an string of four graded stakes wins, including the Santa Anita Handicap.
Split into simpler sentences: In 1992, Desormeaux would become the regular rider of Best Pal. With Desormeaux aboard, Best Pal would put together an string of four graded stakes wins, including the prestigious Santa Anita Handicap.