Complex sentence: The cockpit was at the wing leading edge, with flat and single curvature panelled glazing which extended rearwards behind the leading edge, with side panels below the wing and an upper panel reaching into it for upwards vision.
Split into simpler sentences: The cockpit was at the leading edge, with a flat topped, single curvature panelled glazing. The glazing extended rearwards behind the leading edge with side panels below the wing and an upper panel reaching into it for upwards vision.