Using a relative clause:He said that the men were thieves. This turned out to be true.
【正确答案】正确答案：He said that the men were thieves，which turned out to be true．
【答案解析】解析：要求使用关系分句。This指代的就是that分句后面的内容，因此可以使用非限制性关系分句使句子简洁。