Complex sentence: Bertold of Regensburg (c.1220-1272), the greatest German preacher of the later Middle Ages, was a native of Regensburg, and entered the Franciscan monastery there.
Split into simpler sentences: Bertold of Regensburg (c.1220-1272) was a German preacher of the late Middle Ages. He was a native of Regensburg, and entered the Franciscan monastery there.