Complex sentence: The Murphy raids on the headquarters of the Australian Security Intelligence Organisation (ASIO) occurred on 15 March 1973, and were executed by Australia's Commonwealth Police to obtain information which the ASIO was accused of withholding.
Split into simpler sentences: The Murphy raids on the headquarters of the Australian Security Intelligence Organisation (ASIO) occurred on 15 March 1973. The raids were executed by Australia's Commonwealth Police to obtain information which the ASIO was accused of withholding.