Complex sentence: The wing was mounted on a pedestal faired which sloped away aft into the upper fuselage with the pilot's cockpit, open behind a small windscreen, immediately ahead it below the wing leading edge.
Split into simpler sentences: The wing was mounted on a pedestal which sloped away aft into the upper fuselage. The pilot's cockpit, open behind a small windscreen, was immediately ahead of the pedestal and below the wing leading edge.