Complex sentence: Owing to war-related priorities, the fuselage was constructed almost entirely of wood, in order to save strategic materials, and the plane was designed to be built in as short a time as possible by non-skilled workers.
Split into simpler sentences: Owing to war-related priorities, the fuselage was constructed almost entirely of wood in order to save strategic materials. The plane was also designed to be built in as short a time as possible by non-skilled workers.