Complex sentence: Patronage was a cornerstone of Roman politics, business and social relationships, and its ideology was simple; a good client canvassed for his patron, or his patron's nominee; he advanced his patron's interests using his own business, family and other connections.
Split into simpler sentences: Patronage was a cornerstone of Roman politics, business and social relationships. Its ideology was simple; a good client canvassed for his patron, or his patron's nominee; he advanced his patron's interests using his own business, family and other connections.