Complex sentence: He was originally supposed to become a businessman, but in accordance with his aptitude Baehrens attended the Friedrich-Wilhelm-Gymnasium in Cologne and after his final exam began his studies in classical philology at the Rheinische Friedrich-Wilhelms-Universität Bonn.
Split into simpler sentences: He was originally supposed to become a businessman, but in accordance with his aptitude Baehrens attended the Friedrich-Wilhelm-Gymnasium in Cologne. And affter his final exam, he began his studies in classical philology at the Rheinische Friedrich-Wilhelms-Universität Bonn.