Complex sentence: This army was ambushed twice on the way, lost 1,200 men, and although the siege of Mutina was raised, the army itself fell under a loose siege a few miles from Mutina.
Split into simpler sentences: This army was ambushed twice on the way, losing 1,200 men. Although the siege of Mutina was raised, the army itself fell under a loose siege a few miles from Mutina.