Complex sentence: Her husband, the pharaoh Tao II, had been the pharaoh of only Upper Egypt; at that time the invaders in the Intermediate Period, the Hyksos, controlled Lower Egypt.
Split into simpler sentences: Her husband, pharaoh Tao II, had been the pharaoh of only Upper Egypt. At that time the invaders of the Intermediate Period, the Hyksos, controlled Lower Egypt.