Complex sentence: In Engine Care, teams had to clean an engine pod and associated flap section on the wing of a B-52 bomber until one of the base's sergeants feels the portion of the plane is clean enough.
Split into simpler sentences: In Engine Care, teams had to clean an engine pod on a B-52 bomber. They had to scour the associated flap section on the wing of a bomber until one of the base's sergeants feels the portion of the plane is clean enough.