Complex sentence: FBI assistant director and New York City bureau chief P.E. Foxworth, whose main responsibility at the time was conducting mass roundups of German-Americans suspected of Nazi sympathies, died two months later in the same South American plane crash that killed novelist Eric Knight.
Split into simpler sentences: FBI assistant director and New York City bureau chief P.E. Foxworth's main responsibility at the time was conducting mass roundups of German-Americans suspected of Nazi sympathies. He died two months later in the same South American plane crash that killed novelist Eric Knight.