Complex sentence: From Piedimonte the legion commanded by Major De Blasiis departs on 31 August for Benevento where he entered on 3 September, welcomed by the population liberated for seven centuries of pontifical rule.
Split into simpler sentences: From Piedimonte the legion, under the command of Major De Blasiis, departed on 31 August for Benevento. He entered the city on 3 September, welcomed by the population after having been liberated from seven centuries of pontifical rule.