Complex sentence: Born at Naples, Alfonso was the eldest child of Ferdinand I of Naples and his first wife, Isabella of Clermont, the daughter of Tristan, Count of Copertino and Caterina Del Balzo Orsini.
Split into simpler sentences: Born at Naples, Alfonso was the eldest child of Ferdinand I of Naples by his first wife, Isabella of Clermont. She was the daughter of Tristan, Count of Copertino and Caterina Del Balzo Orsini.