It's a story about a main character who is trying to bring a whole civilization back to life after they had been fossilized and their world decimated a thousand year ago.
この場合、次のように言えますよ。
ーIt's a story about a main character who is trying to bring a whole civilization back to life after they had been fossilized and their world decimated a thousand year ago.
「1000年前に人類が石化され、世界が滅んだ後、文明を取り戻そうとする主人公のストーリです」
to bring a whole civilization back to life「全ての文明の息を吹きかえらす」
to be fossilized で「石化する」
to decimate「滅ぼす」
ご参考まで！
カナダ 
