Complex sentence: Bünning received his primary education in Hamburg from 1912-1925 before attending the University of Göttingen and the University of Berlin from October 1925-July 1928, where Bünning studied biology, chemistry, physics, and philosophy.
Split into simpler sentences: Bünning received his primary education in Hamburg from 1912-1925. Bünning then attended the University of Göttingen and the University of Berlin from October 1925-July 1928, where he studied biology, chemistry, physics, and philosophy.