要拆开。The report details the success /the company has made /over the last year。

是不清楚多了

对。success后面是定语。我一般用语感来判断，话说你为啥要分析呢？

The report details the success (which) the company has made over the last year.

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简单句子 我敲打出来十五字就行了

这句话的知识点：在定语从句中，主句中的先行词在从句中做宾语，那么which就可以省略。

detail在这里是动词啊…6.VERB 详述;详细列举（或说明） If you detail things, you list them or give information about them.
The report detailed the human rights abuses committed during the war.
这份报告详述了战争期间所发生的践踏人权的情况。