Complex sentence: By 1943 Old 666 had suffered heavy battle damage and had gained a reputation as a cursed bomber, often coming back from missions with heavy damage and was parked at the end of the runway where other aircrews could cannibalize it for needed parts.
Split into simpler sentences: By 1943 Old 666 had suffered heavy battle damage and had gained a reputation as a cursed bomber, often coming back from missions with heavy damage. It was parked at the end of the runway where other aircrews could cannibalize it for needed parts.