Complex sentence: In 1933, Roosevelt appointed Walker executive secretary of the president's emergency council, later renamed the National Emergency Council, and in 1940, appointed Walker to the cabinet level post of Postmaster General which he held until 1945.
Split into simpler sentences: In 1933, Roosevelt appointed Walker executive secretary of the president's emergency council, later renamed the National Emergency Council. In 1940, Roosevelt appointed Walker to the cabinet level post of Postmaster General which he held until 1945.