Complex sentence: The use of force to deal with the strikers made Massey an object of hatred for the emerging left-wing, but conservatives (many of whom believed that the unions were controlled by socialists and communists) generally supported him, saying that his methods were necessary.
Split into simpler sentences: The use of force to deal with the strikers made Massey an object of hatred for the emerging left-wing. However, conservatives (many of whom believed that the unions were controlled by socialists and communists) generally supported Massey, saying that his methods were necessary.