Complex sentence: In the 1930s, Hitler had ordered a group of officers led by Dr. Otto Muntsch to study Japan's use of chemical and biological weapons against China, and these programs of scientific cooperation and exchange were formalized in a series of agreements in 1938-39.
Split into simpler sentences: In the 1930s, Hitler had ordered a group of officers led by Dr. Otto Muntsch to study Japan's use of chemical and biological weapons against China. These programs of scientific cooperation and exchange were formalized in a series of agreements in 1938-39.