Complex sentence: Milburn was to remain undefeated in 1971, including winning the 110m hurdles event at the 1971 Pan-American Games, the Opelousas, Louisiana athlete earned the nickname "Hot Rod", and was awarded the "Track and Field News" Athlete of the Year Award.
Split into simpler sentences: Milburn was to remain undefeated in 1971, including winning the 110m hurdles event at the 1971 Pan-American Games. With these performances, the Opelousas, Louisiana athlete earned the nickname "Hot Rod", and was awarded the "Track and Field News" Athlete of the Year Award.