Complex sentence: Usimare Ramesses III (also written Ramses and Rameses) was the second Pharaoh of the Twentieth Dynasty and is considered to be the last monarch of the New Kingdom to wield any substantial authority over Egypt.
Split into simpler sentences: Usimare Ramesses III (also written Ramses and Rameses) was the second Pharaoh of the Twentieth Dynasty. He is considered to be the last monarch of the New Kingdom to wield any substantial authority over Egypt.