Complex sentence: The torpedo programs of the People's Republic of China was set up under the guidance of the former Soviet Union in the 1950s, when China built two torpedo factories under Soviet direction, and began its license assembly of unguided straight-running torpedoes.
Split into simpler sentences: The torpedo programs of the People's Republic of China was set up under the guidance of former-Soviet Union in the 1950s. In the 1950s, China built two torpedo factories under Soviet direction, and begun its license assembly of unguided straight-running torpedoes.