我想问：They have made medicine from a new plant used as a cure for fever. 

如果将上面这句话改为：

They have made medicine from a new plant and used it as a cure for fever. 

那两者有和区别？又该如何翻译呢？

【答】原句：They have made medicine from a new plant used as a cure for fever. 

过去分词短语used as a cure for fever，作定语修饰plant。转换为定语从句，应为：

They have made medicine from a new plant which was used as a cure for fever. 

【翻译】他们用一种曾被用来治疗发烧的新型的植物制成了药品。

新句：They have made medicine from a new plant and used it as a cure for fever. 

used跟made是并列谓语。

【翻译】他们用一种新型的植物制成了药品，并且用其治疗发烧。