Complex sentence: After the battle, the heir to the duchy of Asturia was married to the only son of the duke of Mimbre; though this legally united the kingdom, prejudice and local conflicts between Asturians and Mimbrates continued for generations.
Split into simpler sentences: After the battle, the heir to the duchy of Asturia was married to the only son of the duke of Mimbre. Although this legally united the kingdom, prejudice and local conflicts between Asturians and Mimbrates continued for generations.