How do you analyze a complex sentence?

[whitemoon]

A simple sentence is one which has only one subject and one predicate [p158] (Click here to read more).

I've already understood. But you DID mean:
SIMPLEX SENTENCE. WHAT IS THAT?
You did not mean simple sentence.

[whitemoon]

The problem I see here is that you think 'subordinate' and 'dependent' mean the same thing. They don't. In your example sentence, the subject that you should say so isn't a dependent clause, and therefore cannot be part of a complex sentence:


Simplex sentenceSIMPLEX SENTENCE
Subordinate clause = subject
(The fact) that you should say so surprises me.

Main clause
(The fact) that you should say so surprises me.

What is SIMPLEX SENTENCE?
If you mean simple sentence, I can't accept your idea.
Thank you!

[whitemoon]

These sentences with a subordinate clause as a noun clause subject are also called complex sentences in "Oxford Guide to English Grammar", 1994. p.318.

Wern & Martin say the same.

[Raymott]

Wern & Martin say the same.

Yes I know. I have been following your stimulating conversation with Soup.
Do Wern & Martin give any answers to their exercises? I'm still hoping that you get your definitive reply.

[whitemoon]

Dear Raymott & Soup,
Thank you for your kindest help you have done.
Wern & Martin give many exercises, but no complex sentence in which noun clause does the work of the subject.
I’d like to show one complex sentence:
Exercise 37 (No.9)
They always talk who never think.
The answer: They always talk (Main Clause) , who never think (Adjective Clause)
Here I have a problem. I have already known “Who never think” is a noun Clause, but they answer Adjective Clause.
Could you help me with this problem?
Thank you in advance.

[Raymott]

Dear Raymott & Soup,
Thank you for your kindest help you have done.
Wern & Martin give many exercises, but no complex sentence in which noun clause does the work of the subject.
I’d like to show one complex sentence:
Exercise 37 (No.9)
They always talk who never think.
The answer: They always talk (Main Clause) , who never think (Adjective Clause)
Here I have a problem. I have already known “Who never think” is a noun Clause, but they answer Adjective Clause.
Could you help me with this problem?
Thank you in advance.

It's an unusual sentence structure. It means "They who never think always talk."
"who never think" is an (adjectival) relative clause. Why? Because it qualifies "They".
It explains which "they" the sentence refers to: they who never think.