Complex sentence: The airfield was previously shared with the Royal Air Force base RAF Aldergrove, which closed in 2008; the base is now known as Joint Helicopter Command Flying Station, Aldergrove and both runways are now owned by the airport.
Split into simpler sentences: The airfield was previously shared with the Royal Air Force base RAF Aldergrove which closed in 2008. The base is now known as Joint Helicopter Command Flying Station, Aldergrove and both runways are now owned by the airport.