usage of commas

This is not good English: "as good of a person". The comma before the second 'that' is required.

I would rather write the sentence as such;
'Auther has made Max realize that he is not as good a person as he had thought, he still has much to learn.'
The word 'of' imho opinion does not seem to belong, as it belongs to something else ie: a part of something.
'that' is another wasted word, no need for it. The sentence makes perfect sense without it.
They could also be two different sentences.
'Auther has made Max realize that he is not as good a person as he had thought. He still has much to learn.'
nevermind the 'as good as a person' which is just plain bad english and should probably be written :
'Auther has made Max realize that he is not the good person he had thought he was, he still has much to learn.'

Thanks a lot for your reply. I wonder if it is better to put an "and" before the second "that"?

Thx for your answer. In your "Auther has made Max realize that he is not as good a person as he had thought, he still has much to learn." Is it Ok to link the two independent setences with a comma?

Why not just make it a simple compound sentence ? Use "and" to link the two separate thoughts.