Complex sentence: The warlord defense led by Wu Peifu collapsed on 31 August in which Wu only narrowly fled, and the revolutionary forces reached the heavily fortified Wuchang on 31 August.
Split into simpler sentences: The warlord defense led by Wu Peifu collapsed on 31 August in which Wu only narrowly fled. The revolutionary forces reached the heavily fortified Wuchang on 31 August.