Complex sentence: Diederich Hinrichsen (born 17 February 1939 in Nürnberg), is a German mathematician, whom together with Hans W. Knobloch, established the field of dynamical systems theory and control theory in Germany.
Split into simpler sentences: Diederich Hinrichsen (born 17 February 1939 in Nürnberg), is a German mathematician. Hinrichsen, together with Hans W. Knobloch, established the field of dynamical systems theory and control theory in Germany.