Complex sentence: In the following year he was appointed to the command of the II corps of the army with which Napoléon intended to conquer Spain, and after winning the Battle of Gamonal he was detailed by the emperor to pursue Sir John Moore's British army.
Split into simpler sentences: In the following year he was appointed to the command of the II corps of the army with which Napoléon intended to conquer Spain. After winning the Battle of Gamonal, he was detailed by the emperor to pursue Sir John Moore's British army.