She debuted around the same time as him. Both became prominent writers of their time.
She was also a prominent writer who debuted around the same time as him.
こんにちは。
様々な言い方ができると思いますが、例えば下記のような表現はいかがでしょうか:
・She debuted around the same time as him. Both became prominent writers of their time.
彼女は彼と同時期にデビューしました。どちらも時代の寵児となりました。
・She was also a prominent writer who debuted around the same time as him.
彼女もまた、彼と同時期にデビューした、卓越した作家でした。
prominent は「卓越した」「有名な」のような意味がある英語表現です。
ぜひ参考にしてください。