Complex sentence: Early in his career he worked at the Burghölzli Hospital in Zurich under Eugen Bleuler (1857-1939), and studied experimental psychology with Emil Kraepelin (1856-1926) and Gustav Aschaffenburg (1866-1944) in Munich.
Split into simpler sentences: Early in his career he worked at the Burghölzli Hospital in Zurich under Eugen Bleuler (1857-1939). During this time period he also studied experimental psychology with Emil Kraepelin (1856-1926) and Gustav Aschaffenburg (1866-1944) in Munich.