Complex sentence: Risto Kalervo Näätänen (born June 14,1939 in Helsinki, Finland) was a Finnish psychological scientist, pioneer in the field of cognitive neuroscience, and known worldwide as the discoverer of the electrophysiological mismatch negativity phenomenon.
Split into simpler sentences: Risto Kalervo Näätänen (born June 14,1939 in Helsinki, Finland) was a Finnish psychological scientist. He is a pioneer in the field of cognitive neuroscience and known worldwide as the discoverer of the electrophysiological mismatch negativity phenomenon.