请帮忙分析一下下面这个英语句子的句子成分Japan’s Prime Minister is appealing to the Japanese people to unite to overcome what he says,is the worst crisis his country has faced since the end of World War II.what he says 及之后的部分在整个句子中做何成分?这句话前后分别需要逗号么?
问题描述：
请帮忙分析一下下面这个英语句子的句子成分
Japan’s Prime Minister is appealing to the Japanese people to unite to overcome what he says,is the worst crisis his country has faced since the end of World War II.
what he says 及之后的部分在整个句子中做何成分?这句话前后分别需要逗号么?
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