Complex sentence: The vertical tail was slightly enlarged and skinned in D1 metal, as was the heavily modified nose cowling surrounding the engine, which retained a Riedel two-stroke piston engine starter in the nose'bullet'.
Split into simpler sentences: The vertical tail was slightly enlarged and skinned in D1 metal, as was the nose cowling surrounding the engine. A Riedel two-stroke piston engine starter was retained in the nose'bullet'.