Complex sentence: His only real big accomplishment was the victory at Cudnow, but even that he did not accomplish alone-and he abandoned his army afterwards, seeking praise from the royal court, while the army disintegrated and soldiers went unpaid and wounded were unattended.
Split into simpler sentences: His only real big accomplishment was the victory at Cudnow, but even that he did not accomplish alone. He also abandoned his army afterwards, seeking praise from the royal court, while the army disintegrated and soldiers went unpaid and wounded were unattended.