Complex sentence: In 1941 during World War II, a Royal Airforce base was constructed mainly for the flying experiments for radar that was being developed in nearby Malvern and for a few months the airfield was used as a satellite station by the Wellington bomber training unit based in Pershore.
Split into simpler sentences: In 1941 during World War II, a Royal Air Force airfield was constructed mainly for the flying experiments for radar that was being developed in nearby Malvern. For a few months the airfield was used as a satellite station by the Wellington bomber training unit located in Pershore.