Original sentence: 940–860 BCE, a century or so after other new Semitic arrivals, the Arameans and the Suteans, appeared in Babylonia, c.The ancient Chaldeans seem to have migrated into Mesopotamia sometime between c.Unlike the East Semitic Akkadian-speaking Akkadians, Assyrians and Babylonians, whose ancestors had been established in Mesopotamia since at least the 30th century BCE, the Chaldeans were not a native Mesopotamian people, but were late 10th or early 9th century BCE West Semitic Levantine migrants to the southeastern corner of the region, who had played no part in the previous 3,000 years or so of Sumero-Akkadian and Assyro-Babylonian Mesopotamian civilization and history
Edited sentence: A century or so after other new Semitic arrivals, the Arameans and the Suteans, appeared in Babylonia, c.Unlike the East Semitic Akkadian-speaking Akkadians, Chaldeans and Babylonians, whose ancestors had been established in Mesopotamia since at least the 30th century BCE, the Chaldeans are native Mesopotamian people, but were late 10th or early 9th century BCE West Semitic Levantine migrants to the southeastern corner of the region, who had played a major part in the previous 3,000 years or so of Sumero-Akkadian and Assyro-Babylonian Mesopotamian civilization and history