关于英语语法分析

Whenever I met one of them who seemed to me at all clear-sighted, I tried the experiment of showing him my Drawing Number One, which I have always kept.这个句子中，Whenever I met one of them who seemed to me at all clear-sighted作什么成分？解答的越详细越好，谢谢！

你好，
Whenever I met one of them who seemed to me at all clear-sighted
这是以 Whenever 引导的状语从句，其中又套了个定语从句 who seemed to me at all clear-sighted 修饰先行词one.
Whenever 引导词
I 主语
met 谓语
one of them 宾语
who seemed to me at all clear-sighted 定语从句
who 引导词并在从句中做主语
seemed to me at all clear-sighted 谓语
seemed 系动词
to me at all clear-sighted 表语。追问

可以再具体分析一下who seemed to me at all clear-sighted 这个定语从句，at all怎么理解呢？

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