Complex sentence: Faced with insurmountable hardship, including starvation and famines that caused people to resort to cannibalism, agrarian rebellions became rampant late in his reign, and those rebellions that would plague the reign of his son Emperor Xizong and doom Tang.
Split into simpler sentences: Faced with insurmountable hardship, including starvation and famines that caused people to resort to cannibalism, agrarian rebellions became rampant late in his reign. Those rebellions would plague the reign of his son Emperor Xizong and doom Tang.