Complex sentence: The ancient Canaanites were polytheists who believed in a full pantheon of deities, the chief of whom was the god El, who ruled alongside his consort Asherah and their seventy sons.
Split into simpler sentences: The ancient Canaanites were polytheists who believed in a full pantheon of deities. The chief deity of the pantheon was the god El, who ruled alongside his consort Asherah and their seventy sons.