Complex sentence: Returning to school at Northwestern University's School of Communication, Baer earned a master's degree in theater, and then taught theater part-time for five years at a small, private high school called the Chicago Academy for the Arts.
Split into simpler sentences: Returning to school at Northwestern University's School of Communication, Baer earned a master's degree in theater. After earning his master's degree in theater, Baer taught theater part-time for five years at a small, private high school called the Chicago Academy for the Arts.