Complex sentence: The number of Jewish victims is a subject of debate but it is estimated that 1,000 to 2,000 Polish citizens of Jewish ethnicityreturning home after the Holocaust and repatriated from the East were murdered.
Split into simpler sentences: The number of Jewish victims is a subject of debate. It is estimated that 1,000 to 2,000 Polish citizens of Jewish ethnicityreturning home after the Holocaust and repatriated from the East were murdered.