Complex sentence: In July 1944, when Joseph Goebbels was made Plenipotentiary for Total War, Wegener was made his head of administration; making him one of only two permanent staff members appointed at national level (the other being Werner Naumann as head of planning activties).
Split into simpler sentences: In July 1944, when Joseph Goebbels was made Plenipotentiary for Total War, Wegener was made his head of administration. This made him one of only two permanent staff members appointed at national level (the other being Werner Naumann as head of planning activties).