Complex sentence: Victorious, he forced the Lombard king to return property seized from the Church and confirmed the papacy in possession of Ravenna and the Pentapolis, the so-called Donation of Pepin whereby the Papal States was founded.
Split into simpler sentences: Victorious, he forced the Lombard king to return property seized from the Church. He confirmed the papacy in possession of Ravenna and the Pentapolis, the so-called Donation of Pepin whereby the Papal States was founded.