Alchemists made useless efforts to change one kind of metal into another.翻译 要求包含两个从句谢谢了!能否说下中文句子中,有多个从句是怎么回事

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Alchemists made useless efforts to change one kind of metal into another.翻译 要求包含两个从句
谢谢了!能否说下中文句子中,有多个从句是怎么回事