Complex sentence: Ennio Preatoni (born 11 December 1944) is an Italian former sprinter who competed in the 1964 Summer Olympics, in the 1968 Summer Olympics, and in the 1972 Summer Olympics.
Split into simpler sentences: Ennio Preatoni (born 11 December 1944) is an Italian former sprinter. He competed in the 1964 Summer Olympics, in the 1968 Summer Olympics, and in the 1972 Summer Olympics.