Complex sentence: He spent a large portion of his adult life as an exile in both Paris, where he initially taught Italian, as well as in England, where between 1839 and 1848, he was "Professore di Letteratura italiana" at University College, London.
Split into simpler sentences: He spent a large portion of his adult life as an exile in both Paris, where he initially taught Italian. He also lived in England, where between 1839 and 1848, he was "Professore di Letteratura italiana" at University College, London.