Complex sentence: The people of Yamhad practiced the Amorite Religion, and mainly worshiped the Northwest Semitic deities, most importantly Dagon who was considered the father of Gods, and Hadad who was the most important deity and the head of the Pantheon.
Split into simpler sentences: The people of Yamhad practiced the Amorite Religion, and mainly worshiped the Northwest Semitic deities. Most important of these were Dagon, who was considered the father of Gods, and Hadad, who was the most important deity and the head of the Pantheon.