Essay help

Hello,

I have a question regarding the introduction on the SAT essay and would really appreciate you help.

So I want to begin with the words :
As a Russian novelist, regarded as one of the greatest of all time, Leo
Tolstoy once proclaimed, ‘…’.

Would it be grammatically correct to say it that way. Is it appropriate to use such strong words as ‘one of the greatest’ etc. on the essay?

Thanks in advance.

Oh, I meant

As a Russian novelist, who is regarded as one of the greatest of all time, Leo
Tolstoy once proclaimed, ‘…’.

“The Russian novelist Leo Tolstoy, who is regarded …, once proclaimed …” would be stronger

Wow, this is so much better. Thank you so much!

Avec plaisir. Bon chance.