Complex sentence: Angered by their actions, Otto stripped both men of their duchies of Swabia and Lorraine, and appointed his brother Bruno, the royal chancellor and archbishop of Cologne, as the new Duke of Lorraine.
Split into simpler sentences: Angered by their actions, Otto stripped both men of their duchies of Swabia and Lorraine, respectively. Otto then appointed his brother Bruno, the royal chancellor and archbishop of Cologne, as the new Duke of Lorraine.