Complex sentence: At San Antonio's Alamo Heights High School he was a Texas state football all-star and track athlete who won the 1942 Texas state championship in the 440 yard dash and was part of the state championship mile relay team the same year.
Split into simpler sentences: At San Antonio's Alamo Heights High School he was a Texas state football all-star and track athlete. He won the 1942 Texas state championship in the 440 yard dash and was part of the state championship mile relay team the same year.