The buildings that he designed are modern in style, but he treasures the Japanese tradition and he makes sure that his designs match the surrounding environment.
ご質問ありがとうございます。
"The buildings that he designed are modern in style,"＝「彼がデザインした建物は近代的である」
"but he treasures the Japanese tradition"＝「でも、彼は日本の伝統を大事にしている」
"and he makes sure that his designs match the surrounding environment."＝「そして彼は自分がデザインしたものが周囲の環境に合うように気を付けている。」
ご参考に。
アメリカ合衆国 
