Complex sentence: Despite this setback Æthelwulf did have some success against the Vikings, the Anglo Saxon Chronicle has repeated references, during his reign, of victories won by ealdormen with the men of their shires.
Split into simpler sentences: Despite this setback Æthelwulf did have some success against the Vikings. The Anglo-Saxon Chronicle has repeated references during his reign of victories won by ealdormen with the men of their shires.