Complex sentence: Clemente Jr. returned to Puerto Rico to help his mother in her quest to open the "Roberto Clemente Sports City", and, in 1992, he created the RBI Baseball program, aimed at bringing children to his sport.
Split into simpler sentences: Clemente Jr. returned to Puerto Rico and helped his mother in her quest to open the "Roberto Clemente Sports City". In 1992, he created the RBI Baseball program, aimed at bringing children to his sport.