Complex sentence: Today, most of the airfields in the Northern Territory have returned to their natural state, being abandoned after the war, but most of the airfields in Queensland and the other Australian states and territories still exist as civilian airports or military bases.
Split into simpler sentences: Today, most of the airfields in the Northern Territory have returned to their natural state, being abandoned after the war. However most of the airfields in Queensland and the other Australian states and territories still exist as civilian airports or military bases.