Complex sentence: The armament camp continued to be busy into the late 1930s with the camp being renamed No.1 Armament Training Station but with the approach of war it was decided the east coast was too vulnerable to attack for training and the unit moved out during 1939.
Split into simpler sentences: The armament camp continued to be busy into the late 1930s, being renamed No.1 Armament Training Station. With the approach of war, it was decided that the east coast was too vulnerable to attack for training and the unit moved out during 1939.