Complex sentence: The Ardennes-Verdun dynasty was one of the first documented medieval European noble families centered on Verdun, who dominated in the Duchy of Lotharingia (Lorraine) in the 10th and 11th centuries.
Split into simpler sentences: The Ardennes-Verdun dynasty was one of the first documented medieval European noble families, centered on Verdun. The family dominated in the Duchy of Lotharingia (Lorraine) in the 10th and 11th centuries.