Complex sentence: A major commercial development also called "Old Armenian Town" is underway and contains a courthouse for California's Fifth Appellate District Court of Appeals, a major multi-story commercial office building, and an Armenian Museum.
Split into simpler sentences: A major commercial development also called "Old Armenian Town" is underway in this area. Within the projects are a courthouse for California's Fifth Appellate District Court of Appeals, a major multi-story commercial office building, and an Armenian Museum.