Complex sentence: On 1 October 1958,542 Squadron was re-numbered as 21 Squadron with the Canberra B6, and was detached to Australia in support of trials of nuclear weapons.
Split into simpler sentences: On 1 October 1958 542 Squadron was re-numbered as 21 Squadron with the Canberra B6. It was detached to Australia in support of the trials of nuclear weapons.