Complex sentence: There was a great demand for the work of Cornelis de Wael and his patrons included the rich patricians of the Government of the Republic of Genoa as well as Philip III of Spain and Philippe-Charles, 3rd Count of Arenberg.
Split into simpler sentences: There was a great demand for the work of Cornelis de Wael. His patrons included the rich patricians of the Government of the Republic of Genoa as well as Philip III of Spain and Philippe-Charles, 3rd Count of Arenberg.