Complex sentence: While they established an Amun cult in many Nubian locales, beneath the Mount Barkal cliff, the Egyptians constructed a major religious center, named Napata, which became the southernmost town in the Egyptian's African empire.
Split into simpler sentences: While they established an Amun cult in many Nubian locales, beneath the Mount Barkal cliff, the Egyptians constructed a major religious center. The settlement, named Napata, became the southernmost town in the Egyptian's African empire.