Complex sentence: Germany suspended all civil flights to West Africa in August 1939 and initiated World War 2 on 1 Sept 1939, at which time the DLH fleet came under command of the Luftwaffe.
Split into simpler sentences: Germany suspended all civil flights to West Africa in August 1939. On 1 Sept 1939, it initiated World War 2 and the DLH fleet came under command of the Luftwaffe.