Complex sentence: After the Anglo-Boer War, Swaziland was a British protectorate from 1903 until 1967, gaining independence on 6 September 1968.
Split into simpler sentences: After the Anglo-Boer War, Swaziland was a British protectorate from 1903 until 1967. After this period it was a protected State, finally gaining independence on 6 September 1968.