How do you analyze a complex sentence?

[whitemoon]

"That you should say so suprises me."
How do you analyze the above complex sentence?

[awatef]

that you should say so =subject
surprises=verb
me=direct object

[Soup]

Could it be elliptical?

Ex: (The fact) that you should say so ... .

[awatef]

that you should say so is a relative clause

[Soup]

that you should say so is a relative clause

What is its noun?

[whitemoon]

that you should say so =subject
surprises=verb
me=direct object

This is to say you don't understand what a complex sentence is.
First of all, try to understand a complex sentence and then analyze complex sentences.
Some complex sentences are difficult to analyze.
With kindest wishes!

[whitemoon]

Could it be elliptical? (I think you don't understand a complex sentence.)

Ex: (The fact) that you should say so ... .You can't add the fact because that is a noun clause. If you add "the fact" before "that you should say so", it becomes adjective clause.

Suppose you may do. If you add "the fact" before "that you should say so", what do you add before the following sentence?
What he said was true.
This is a complex sentence also.
What do you add before "what he said"?
With kindest wishes!

[whitemoon]

that you should say so is a relative clause

Right! Exactly, a noun clause.

[whitemoon]

What is its noun?

How do you think?

[Raymott]

"That you should say so suprises me."
How do you analyze the above complex sentence?

What do you mean by "analyze"? Do you want each word and phrase labelled with a part of speech?