Complex sentence: He attended the Gymnasium and the Liceo classico of Casale Monferrato, and was then educated at the Università Cattolica del Sacro Cuore of Milan, where he graduated.
Split into simpler sentences: He attended the Gymnasium and the Liceo classico of Casale Monferrato. Then he formed at the Università Cattolica del Sacro Cuore of Milan, where he graduated.