Complex sentence: Of metal stressed-skin construction and powered by an Hispano-Suiza 12Ycrs 12-cylinder liquid-cooled engine, the Arsenal-Delanne 10-C2 prototype was virtually complete at Villacoublay when German forces occupied the factory in June 1940.
Split into simpler sentences: Of metal stressed-skin construction the aircraft was powered by an Hispano-Suiza 12Ycrs 12-cylinder liquid-cooled engine. The Arsenal-Delanne 10-C2 prototype was virtually complete at Villacoublay when German forces occupied the factory in June 1940.