Complex sentence: On 27 June 1940 he was promoted to Chief Justice of the Supreme Court, an office he held until 15 May 1946, when he left to take a seat on the High Court of Australia.
Split into simpler sentences: On 27 June 1940 he was promoted to the Chief Judge as the Supreme Court. He kept this position until 15 May 1946 when he left to take a position on the High Court of Australia.