Complex sentence: Hans Jürgen Eysenck (4 March 1916--4 September 1997) was a German-British psychologist who spent most of his career in Britain, best remembered for his work on intelligence and personality, though he worked in a wide range of areas.
Split into simpler sentences: Hans Jürgen Eysenck (4 March 1916--4 September 1997) was a British psychologist, born in Germany, who spent his professional career in Great Britain. He is best remembered for his work on intelligence and personality, though he worked in a wide range of areas.