Original: Some of the important historical Mesopotamian leaders were Ur-Nammu (king of Ur), Sargon (who established the Akkadian Empire), Hammurabi (who established the Old Babylonian state), and Tiglath-Pileser I (who established the Assyrian Empire).
Simplified: Some of the important historical Mesopotamian leaders were Ur-Nammu (king of Ur), Sargon (who started the Akkadian Kingdom), Hammurabi (who established the Old Babylonian state), and Tiglath-Pileser I (who started the Assyrian Empire).