Original sentence: The campus consists of three locations: a "Gold campus" building (in a converted former Crone Middle School) for Freshmen (Grade 9) and a "Blue campus" building (the original NVHS main building) for Sophomores, Juniors and Seniors (Grades 10-12)
Edited sentence: The campus consists of three locations: a "Gold campus" building (in a converted former Crone Middle School) for Freshmen (Grade 9) and a "Main campus" building (the original NVHS main building) for Sophomores, Juniors and Seniors (Grades 10-12)