Complex sentence: She was later called before the House Un-American Activities Committee for her work as a Party organizer and was the first person who the U.S. government tried to denaturalize and deprive of citizenship for such activities.
Split into simpler sentences: She was later called before the House Un-American Activities Committee for her work as a Party organizer. The U.S. government tried to denaturalize her and deprive her of citizenship for such activities.