Complex sentence: In early 1970, Aircraft No.293 was lost during a fuel run to an American base close to the Cambodian border; the base was under siege at the time by Viet Cong troops and No.293 received a direct mortar hit in the wing whilst taxiing.
Split into simpler sentences: In early 1970 Aircraft No.293 was lost during a fuel run to an American base close to the Cambodian border. The base was under siege at the time by Viet Cong troops and No.293 received a direct mortar hit in the wing whilst taxiing.