Complex sentence: Left without a real army, Enghien was unable to capture Milan; d'Avalos, meanwhile, routed a fresh force of Italian infantry under Pietro Strozzi and the Count of Pitigliano at the Battle of Serravalle.
Split into simpler sentences: Left without a real army, Enghien was unable to capture Milan. D'Avalos, meanwhile, routed a fresh force of Italian infantry under Pietro Strozzi and the Count of Pitigliano at the Battle of Serravalle.