It's kind of amazing to think that the powdered laundry detergent we used when we were kids has now become available in liquid form.
この場合、次のような言い方ができますよ。
ーIt's kind of amazing to think that the powdered laundry detergent we used when we were kids has now become available in liquid form.
「子供の頃使った粉末の洗濯洗剤が液体にもなったなんてちょっとすごいよね」
powdered laundry detergent「粉末タイプの洗濯洗剤」
to become available in liquid form「液体でも入手可能になる」
ご参考まで！
I find it impressive that they transitioned laundry detergent from powder form to liquid form. All laundry detergents were in powder form when I was a kid.
こんにちは！
ご質問ありがとうございます。
ご質問について、いくつか言い方が考えられますが、例えば、
I find it impressive that they transitioned laundry detergent from powder form to liquid form. All laundry detergents were in powder form when I was a kid.
とすると、『洗濯[洗剤](https://eikaiwa.dmm.com/uknow/questions/33794/)を粉から液体に変えたことはすごいと思います。私が子供のころは粉しかありませんでした。』となります。
参考になれば幸いです。
カナダ 
日本 
