Complex sentence: Porter served in Germany under two mission presidents who were both native Germans holding United States citizenship, Walter H. Kindt and Rudolf K. Poecker, who served as consecutive mission presidents and had served as missionary companions in the immediate postwar period in what became communist East Germany.
Split into simpler sentences: Porter served in Germany under two mission presidents who were both native Germans holding United States citizenship, Walter H. Kindt and Rudolf K. Poecker. They served as consecutive mission presidents and had served as missionary companions in the immediate postwar period in what became communist East Germany.