Complex sentence: His legions retreated south towards Brundisium, where Pompey intended to find renewed strength by waging war against Caesar in the east, by using his strategic resources in the east, as well as his naval strength to defeat Caesar's forces.
Split into simpler sentences: His legions retreated south towards Brundisium, where Pompey intended to find renewed strength by waging war against Caesar in the east. By using his strategic resources in the East, as well as his naval strength to defeat Caesar's forces.