Original sentence: He was the leading figure in the development of rocket technology in Germany and a pioneer of rocket technology and space science in the United States.While in his twenties and early thirties, von Braun worked in Nazi Germany's rocket development program
Edited sentence: He was the leading figure in the development of rocket technology in Nazi Germany and a pioneer of rocket technology and space science in the United States.While in his twenties and early thirties, von Braun worked in the Third Reich's rocket development program