Complex sentence: Krzysztof Antoni Meissner (born 1 September 1961 in Warsaw, Poland) is a Polish theoretical physicist, specializing in elementary particles theory, and a professor of physics at the University of Warsaw, Faculty of Physics, Institute of Theoretical Physics.
Split into simpler sentences: Krzysztof Antoni Meissner (born 1 September 1961 in Warsaw, Poland)-Polish theoretical physicist, specializing in elementary particles theory. Professor of physics at University of Warsaw, Faculty of Physics, Institute of Theoretical Physics.