Complex sentence: The barrel, body (receiver) and trigger mechanism of the Mark II Sten were copied, whilst the folding stock and bolt, with separate firing pin and telescopic cover over the return spring, were copied from the German MP40.
Split into simpler sentences: The barrel, body (receiver) and trigger mechanism of the Mark II Sten were copied. The folding stock and bolt, with separate firing pin and telescopic cover over the return spring, were copied from the German MP40.