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I think it is so obvious that as you walk here, you are waiting because you said this.

I (S)

think (V)

(that) it is so obvious (DO/Noun Clause)

that as you walk here, you are waiting (complex noun clause in apposition to the explextive 'it'?): I think that as you walk here, you are waiting is obvious because...

Or is it (Complex adverbial clause, modifying the predicate adjective 'obvious)

because you said this (adverbial clause, modifying the adjective 'obvious', saying why it is so obvious).

The one in blue is clearly the most troublesome for me.
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Your original sentence makes no sense.
Comments  
Are you sure. With context it is clear to me:

It was from another forum, where someone asked about time sequences for the following sentence:

a) I will walk here, waiting for my friend to turn up.

In your first sentence,I think it is so obvious that as you walk 'here', you are waiting because you said "here" not "there".