Complex sentence: Deciding on a stage management career, Francis went to Columbia University, where he entered graduate classes in Dramatic Literature, mostly attending the classes of the Brecht scholar Eric Bentley, as well as becoming acquainted with the work of the critic George Jean Nathan.
Split into simpler sentences: Deciding on a stage management career, Francis went to Columbia University, where he studied Dramatic Literature, mostly attending the classes of the Brecht scholar Eric Bentley. He also became acquainted with the work of the critic George Jean Nathan.