Complex sentence: The film was one of the last silent movies in China, and the only silent movie Zhou Xuan starred in, where the songs in the film were probably played for the audience on a gramophone synchronized with the action.
Split into simpler sentences: The film was one of the last silent movies in China, and the only silent movie Zhou Xuan starred in. The songs in the film were probably played to the audience on a gramophone synchronized with the action.