Since new China was found,he had been looking forward to ret

没有,因为前提条件 was found是过去式,所以 had been looking forward 要在过去的过去,所以是过去完成时
再问： 我觉得得先found 才会look forward 吧动作顺序应该是这样的
再答： 我感觉也是，呵呵，since和现在完成时搭配。。。不好意思