Complex sentence: Moshe Rosman from YIVO Institute for Jewish Research Most Jews lived outside Ukraine in the territories unaffected by the uprising, as the Jewish population of Ukraine of that period is estimated at about 50,000.
Split into simpler sentences: Moshe Rosman from YIVO Institute for Jewish Research Most Jews lived outside Ukraine in territories unaffected by the uprising. The Jewish population of Ukraine of that period is estimated at about 50,000.