Complex sentence: Ugo's friend Zeller who came to Ravenna to make a business deal pursues her attracted by her beauty and enigma starting to understand her troubles better than her occupied husband but still not enough.
Split into simpler sentences: Ugo's friend Zeller, who came to Ravenna to make a business deal, pursues her attracted by her beauty and enigma. He begins to understand her troubles better than her preoccupied husband, but it is still not enough.