Complex sentence: From Arnaud were descended the Lords of Versols, in Aveyron, and of Saint-Etienne de Gourgas, whose best known member was Guillaume de Roquefeuil, signatory of the Treaty of Corbeil on behalf of King James of Aragon in 1258.
Split into simpler sentences: From Arnaud were descended the Lords of Versols, in Aveyron, and of Saint-Etienne de Gourgas. Their best known member was Guillaume de Roquefeuil who signed the Treaty of Corbeil on behalf of King James of Aragon in 1258.