Complex sentence: Scenes for the film were shot in Glendale, California and Malibu, California; the film had to receive permission from the U.S. Army to shoot in Malibu, due to wartime restrictions.
Split into simpler sentences: Scenes for the film were shot in Glendale, California and Malibu, California. Permission had to be granted permission from the U.S. Army to shoot in Malibu due to wartime restrictions.