Complex sentence: About three hundred prisoners came from Eastern and Southeastern Europe, mainly Poland, but otherwise little is known about the Polish women except that many of them were taken as slave labor in reprisal for the 1943 Warsaw Ghetto Uprising.
Split into simpler sentences: About three hundred prisoners came from Eastern and Southeastern Europe, mainly Poland. Many of them were taken as slave labor in reprisal for the 1943 Warsaw Ghetto Uprising.