Complex sentence: The reemergence of anti-Semitism under Joseph Stalin prompted Regina to go with Joan to Paris, France, where Regina became an English teacher; the threat of a German invasion led her and Joan to go to the United States in 1939.
Split into simpler sentences: The reemergence of anti-Semitism under Joseph Stalin prompted Regina to go with Joan to Paris, France, where Regina became an English teacher. The threat of a German invasion led her and Joan to go to the United States in 1939.