Complex sentence: He was the 2nd African-American (Donald Gaffney) who played the quarterback position for the Florida Gators where he led the vaunted "gatorbone" offense, a variation of the wishbone.
Split into simpler sentences: He was the 2nd African-American, following Donald Gaffney, who played the quarterback position for the Florida Gators. He led the vaunted "gatorbone" offense, a variation of the wishbone.