Complex sentence: Although they came from different political horizons, these leaders were intent on the peacefulness of the march, which even had its own marshal to ensure that the event would be peaceful and respectful of the law Barber, Lucy.
Split into simpler sentences: Although they came from different political horizons, these leaders were intent on the peaceful success of the march. The march even had its own marshal, ensuring that the event would be peaceful and respectful of the law Barber, Lucy.