Complex sentence: Two of Dufek's sons played football for the Michigan Wolverines, Bill and Don Dufek, Jr.-who was an All-American and one of the original members of the Seattle Seahawks.
Split into simpler sentences: Two of Dufek's sons played football for the Michigan Wolverines. Son Don Dufek, Jr. was an All-American and one of the original members of the Seattle Seahawks.