After the war Rosengart tried to guide his company back to the small cars that had made it a success in the late 1920s and early 1930s .
Rosengart had been in the United States ( while his son stayed in the south of France ) .
After the war Rosengart , who had been in the United States ( while his son stayed in the south of France ) , tried to guide his company back to the small cars that had made it a success in the late 1920s and early 1930s .