Complex sentence: According to some colleagues, Williams arrived at the plant in a very agitated state and made threats to kill other workers, though others who had talked to him prior to the shooting stated that he "gave no indications that anything was wrong".
Split into simpler sentences: According to some colleagues, Williams arrived at the plant in a very agitated state and made threats to kill other workers. Others said they talked to him prior to the shooting stated that he "gave no indications that anything was wrong".