I read your comment and it was very informative/insightful
I learnt a lot from your comment
「貴方のコメント読みました、凄く勉強になる」は英語で I read your comment and it was very informative/insightful もしくは I read your comment and I learnt a lot. 別の言い方として Your comment was very insightful/informative もしくは I learnt a lot from your commentでも大丈夫だと思います。
貴方のコメント- Your comment(s)
読みました- read
凄く - very, extremely, incredibly
勉強になる- informative / educational
Insightful は形容詞で、少し硬い言葉です。