Complex sentence: Marwil Bookstore was last located at 4870 Cass Avenue (corner of Cass and Warren Ave.) in the Midtown area of Detroit, Michigan on Wayne State University's main campus, across Cass from the Old Main Building and across Warren from the Science Building.
Split into simpler sentences: Marwil Bookstore was last located at 4870 Cass Avenue (corner of Cass and Warren avenues) in the Midtown area of Detroit on Wayne State University's main campus. It was across Cass from the Old Main Building and across Warren from the Science Building.