Complex sentence: By contrast, Southern China remained relatively free from Han control as the Han emperor had failed initially to conquer present-day Fujian, where the Minyue Kingdom stood, and was unceremoniously driven out of what is present-day Vietnam by the Trung sisters.
Split into simpler sentences: By contrast, Southern China remained relatively free from Han control. The Han emperor had failed initially to conquer present-day Fujian, where the Minyue Kingdom stood, and was unceremoniously driven out of what is present-day Vietnam by the Trung sisters.