Complex sentence: Benjamin B. Bourdon (1860--1943) was a French psychologist born in Normandy on August 5th, 1860, who is often referred to as a pioneer of experimental psychology in France.
Split into simpler sentences: Benjamin B. Bourdon (1860--1943) was a French psychologist born in Normandy on August 5th, 1860. He is often referred to as a pioneer of experimental psychology in France.