[問題] 請問這句英文能簡化嗎?

[brandenta (brandenta)]

There are several problems in the U.S. which had been left unsolved.
請問可以簡化成:
there are several problems in the U.S. been left unsolved.嗎?
還是有其他的簡化法?
謝謝

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推 Georgiana:There are several unresolved problems in the U.S.
推 han2312:推樓上