Complex sentence: Halesworth was built in 1942--1943 and was intended for use as a bomber station, and was built as such with a 6,000 ft. main runway and two secondary runways of 4,200 ft length.
Split into simpler sentences: Halesworth was built in 1942--1943 and was intended for use as a bomber station. It was built as a bomber station, with a 6,000 ft. main runway and two secondary runways of 4,200 ft length.