Complex sentence: Robert H. Hewsen (born 1934) is Professor Emeritus of History at Rowan University in Glassboro, New Jersey and is an expert on the ancient history of the South Caucasus.
Split into simpler sentences: Robert H. Hewsen (born 1934) is an American historian and, Professor Emeritus of History at Rowan University. He is an expert on the ancient history of the South Caucasus.