Complex sentence: In 1976, the boy's cross country team won the Orange league championship defeating top ten ranked Buena Park High School and finished 3rd in the CIF-2A finals to Salesian and Upland High Schools.
Split into simpler sentences: In 1976, the boy's cross country team won the Orange league championship by defeating top ten ranked Buena Park High School. The team ended the 1976 season finishing 3rd in the CIF-2A finals to Salesian and Upland High Schools.