Complex sentence: Instead, Frank decides to continue his life as a vigilante, in the closing period of the film he dictates: Those who do evil to others--the killers, the rapists, psychos, sadists--will come to know me well.
Split into simpler sentences: Instead, Frank decides to continue his life as a vigilante. In the closing period of the film he dictates: Those who do evil to others--the killers, the rapists, psychos, sadists--will come to know me well.