Complex sentence: When the king of Qin found out, he was very angry and threatened to execute Lin Xiangru, Lin Xiangru quickly persuaded the furious king that there could be a real swap on the condition that Lin Xiangru could be spared.
Split into simpler sentences: When the king of Qin found out, he was very angry and threatened to execute Lin Xiangru. However, Lin Xiangru quickly persuaded the furious king that there could be a real swap on the condition that his life be spared.