Complex sentence: Although the airfield closed after the war and returned to agricultural use, parts of the Brandiston-Swannington road and the road to the east of the church still run over remains of the concrete runways.
Split into simpler sentences: Although the airfield closed after the war and returned to agricultural use, substantial evidence of it remains, notably on the road to the east of the church and along the Brandiston-Swannington road. Parts of both roads still run over remains of the concrete runways.