Original sentence: It is located in the Roman Catholic Diocese of San Diego.Mater Dei Catholic replaced its former school, Marian Catholic in September, 2007.The rebuilding/renaming came as a result of the Diocese's decision to upgrade all of its secondary campuses in the last five years
Edited sentence: It is located in the newly formed Diocese of Chula Vista, the school sits between Otay Ranch High School and Olympian High School.The was formally known as Marian Catholic High School but was renamed and reopened because the Diocese of San Diego saw a need to replace the old crumbling campus