Complex sentence: On 10 July, as the Australian 21st Brigade was on the verge of entering Beirut, Dentz sought an armistice and at one minute past midnight on 12 July, a ceasefire came into effect and ended the campaign.
Split into simpler sentences: On 10 July, as the Australian 21st Brigade was on the verge of entering Beirut, Dentz sought an armistice. At one minute past midnight on 12 July, a ceasefire came into effect and ended the campaign.