Complex sentence: In November 1942, as Germany invaded the previously unoccupied southern zone of France, German troops moved into Camp Joffre, and it was closed as an internment camp on November 25.
Split into simpler sentences: In November 1942, as Germany invaded the southern, previously unoccupied zone of France, German troops moved into Camp Joffre. Accordingly, the camp was closed as an internment camp on November 25.