sentence: Founded in the 12th century , it came through all the important events of Eastern European history , from the Tatar invasions to World War II , which was a real disaster .
modified: Founded in the 12th century , it came through all important events of Eastern Europe history , from Tatar invasions till the World War II which was a real disaster .
transformation: DET, MORPH, DET, PREP, DET, PUNCT