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I found the following sentence in a book 

"The display was not as spectacular as the fireworks celebrating the king's marriage, but it was impressive nevertheless"

Is it grammatically correct??

Is it the same as 

"The display was not as spectacular as the fireworks celebrating the king's marriage. Nevertheless, it was impressive"
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Yes, both are grammatically correct. The word 'but' is a conjunction in your first sentence.
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Hi,
Hmmm. What's an 'intellectual country'?

Clive
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Comments  
so
"The display was not as spectacular as the fireworks celebrating the king's marriage, but it was impressive nevertheless." CORRECT

"The display was not as spectacular as the fireworks celebrating the king's marriage. Nevertheless, it was impressive." CORRECT

what about

"The display was not as spectacular as the fireworks celebrating the king's marriage, it was impressive nevertheless."

"The display was not as spectacular as the fireworks celebrating the king's marriage; it was impressive nevertheless."
"The display was not as spectacular as the fireworks celebrating the king's marriage, but it was impressive nevertheless." CORRECT

"The display was not as spectacular as the fireworks celebrating the king's marriage. Nevertheless, it was impressive." CORRECT

"The display was not as spectacular as the fireworks celebrating the king's marriage, it was impressive nevertheless." INCORRECT (This is a comma splice/run-on sentence)

"The display was not as spectacular as the fireworks celebrating the king's marriage; it was impressive nevertheless." OK
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Mccain is a good person but nevertheless he is not qualifed to be president of this intellectual country.
 Clive's reply was promoted to an answer.