Complex sentence: Henry Steele Commager (October 25,1902-March 2,1998) was a noted American historian who wrote (or edited) over forty books and over 700 journalistic essays and reviews, and taught at New York University, Columbia, and Amherst College.
Split into simpler sentences: Henry Steele Commager (October 25,1902-March 2,1998) was a noted American historian who wrote (or edited) over forty books and over 700 journalistic essays and reviews. In addition, he taught at New York University, Columbia, and Amherst College.