Complex sentence: In 1236 Ezzolino married Selvaggia, Frederick's natural daughter who was thirteen years old at the time; conquered Verona and by treason Padua, seizing the position of "podestà" of that city.
Split into simpler sentences: In 1236 Ezzolino married Selvaggia, Frederick's natural daughter, who was thirteen years old at the time. Ezzelino conquered Verona and, by treason, Padua, seizing the position of "podestà" of that city.