Complex sentence: John Anthony Galignani (1796--1873), and William (1798--1882), publishers of Paris, were the sons of Giovanni Antonio Galignani (1757--1821), by Anne Parsons (1776--1822).
Split into simpler sentences: John Anthony Galignani (1796--1873), and William (1798--1882), were publishers of Paris. They were the sons of Giovanni Antonio Galignani (1757--1821), by Anne Parsons (1776--1822).