Complex sentence: Behind it, the rectangular cross-section fuselage was plywood-covered and flat-sided apart from curved decking, with two open cockpits, equipped with dual control, in tandem over the wing.
Split into simpler sentences: Behind it, the rectangular cross-section fuselage was plywood-covered and flat-sided apart from curved decking. There were two open cockpits, equipped with dual control, in tandem over the wing.