Complex sentence: Professor Kazimierz Kostanecki (25 December 1863, Myszaków--11 January 1940, Sachsenhausen concentration camp) was a Polish physician, anatomist, and cytologist; since 1892 professor of comparative and descriptive anatomy at the Jagiellonian University in Kraków under the military partitions of Poland.
Split into simpler sentences: Professor Kazimierz Kostanecki (25 December 1863, Myszaków--11 January 1940, Sachsenhausen concentration camp) was a Polish physician, anatomist, and cytologist. Since 1892 he was a professor of comparative and descriptive anatomy at the Jagiellonian University in Kraków under the military partitions of Poland.