Complex sentence: Montana Avenue is also honored with the 1939 landmark Aero Theater, built by Donald Douglas Company as a continuous around-the-clock movie theater as an accommodation to aircraft worker shifs, and which is now a repertory theater operated by The American Cinematheque.
Split into simpler sentences: Montana Avenue is also honored with the 1939 landmark Aero Theater, built by Donald Douglas Company as a continuous around-the-clock movie theater as an accommodation to aircraft shift workers. This is now a repertory theater operated by The American Cinematheque.