What I've learned here is that if you believe in the long term, your day eventually arrives？

What I've learned here是由what引导的名次性从句做主语，谓语是is，而后面又是that引导的表语从句，在这个表语从句中，又有个if引导的状语从句，其实弄清句子成分了就好懂了。

What I've learned here（主语从句） is （系动词）that if you believe in the long term, your day eventually arrives（表语从句）？
其中表语从句含有一个条件状语从句if you believe in the long term。追问

谢谢你

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