Complex sentence: The son of Matsudaira Katamori of Aizu, Tsuneo served as Japanese Ambassador to the United States and in 1929-1935 as Ambassador to Britain, and in 1936-1945 as head of the Imperial Household Agency.
Split into simpler sentences: The son of Matsudaira Katamori of Aizu, Tsuneo served as Japanese Ambassador to the United States. In 1936-1945 served as head of the Imperial Household Agency.