Complex sentence: Jesus "Hit man" Becerra (15 April 1936 in Guadalajara, Jalisco, Mexico) is a former Mexican boxer, who became world champion in the bantamweight division.
Split into simpler sentences: Jesus "Hit man" Becerra (15 April 1936 in Guadalajara, Jalisco, Mexico) is a retired Mexican boxer. He became world champion in the bantamweight division.