Anyone sees this sentence awkward?

Take a look at the following sentence

Some psychologists have characterized all infant language-learning as
problem-solving, extending to children such scientific procedures as
"learning by experiment," or "hypothesis-testing."

This sentence is just a small portion of the text that I’m supposed to solve problems with.

I’m not a native English speaker, but I lived long enough in America and I know an awkward sentence when I read one.

This sentence just sounds "wrong" to me.

The first part of the sentence, everything before the comma, sounds just fine. But after the comma, even though I understand what it’s trying to say, it just seems so awkward.

I tried to change the sentence by switching the order, like

Some psychologists have characterized all infant language-learning as
problem-solving, extending such scientific procedures as "learning by
experiment," or "hypothesis-testing." to children.

But the thing is, the sentence still seems awkward to me.

I just want to know if this sentence is grammatically correct and is using the standard structure of a sentence.

It would also be helpful if someone could actually tell me what this sentence is talking about.

Any help would be greatly appreciated

Thanks!

EDIT:

I don’t understand the second part of the sentence. To simplify the sentence, I wrote out the sentence like

extending to children such A as B.

I don’t understand how this could be a ‘correct sentence’, nor do I understand what it’s trying to say.