请问这句话的语法正确吗?

题目

请问这句话的语法正确吗?
To identify the two substances, which are chosen randomly amongst six white powders, by carrying out a range of experiments. 如有语病请予以纠正,谢谢各位大虾了...
不好意思，没粘贴全。这是个化学报告，开头原句是这样的
Aim：To identify the two substances, which are chosen randomly amongst six white powders, by carrying out a range of experiments.

答案

可改为：
To identify the two substances,which are chosen randomly amongst six white powders,a range of experiments has been carried out.

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