Complex sentence: Christopher Phelps (born 1965) is an American historian whose scholarship is primarily concerned with the history of philosophical pragmatism, the fate of socialism and the American left in the twentieth century, and conceptions of race.
Split into simpler sentences: Christopher Phelps (born 1965) is an American historian whose scholarship is primarily concerned with the intellectual and political past. He has written most frequently on the history of philosophical pragmatism, the fate of the socialist ideal and the American left in the twentieth century, and concepts of race.