Complex sentence: Czesław Olech (born May 22,1931, died July 1,2015) was a Polish mathematician, representative of the Kraków school of mathematics, especially the differential equations school of Tadeusz Ważewski.
Split into simpler sentences: Czesław Olech (born May 22,1931) is a Polish mathematician. He is a representative of the Kraków school of mathematics, especially the differential equations school of Tadeusz Ważewski.