Original sentence: Polish Institute of National Remembrance which carried a research into those events declared Przyszowice massacre a crime against humanity.The Przyszowice massacre ( or ) was a massacre committed by Red Army on civilian inhabitants of Polish village of Przyszowice in Upper Silesia in the days of January 26 to January 28, 1945
Edited sentence: The Przyszowice massacre ( or ) was a war crime committed by Red Army on civilian inhabitants of Polish village of Przyszowice in Upper Silesia in the days of January 26 to January 28, 1945