Complex sentence: With her parents Frieda Duhl and Chaim Leopold, she fled to Vienna during World War I, and after returning to Poland after the war, she emigrated to New York in 1921, where she attended Hunter College and the Jewish Teachers Seminary.
Split into simpler sentences: With her parents Frieda Duhl and Chaim Leopold, she fled to Vienna during World War I. After the war, the family returned to Poland. Lee then emigrated to New York in 1921, where she attended Hunter College and the Jewish Teachers Seminary.