impressed by the new look of the campus,the guests were shown around by the pincipal.
如果我没有猜错的话,你后面的要求（过去分词短语做时间状语）不太妥.做定语的话,这个句子倒是很好处理的
中译英高手来校长带领客人们参观了校园,校园的新貌给他们留下了深刻的印象（过去分词短语做时间状语）
impressed by the new look of the campus,the guests were shown around by the pincipal.
如果我没有猜错的话,你后面的要求（过去分词短语做时间状语）不太妥.做定语的话,这个句子倒是很好处理的