Japanese people used to be very noble a long time ago.
Many generations ago, Japanese people were known for their nobility.
ーJapanese people used to be very noble a long time ago.
「昔、日本人はとても気高かった」
used to で「以前は…だった」
noble で「気高い」
a long time ago で「昔」
ーMany generations ago, Japanese people were known for their nobility.
「昔、日本人は気高さで知られていた」
many generations ago で「何世代も前・昔」
to be known for ... で「…で知られている」
nobility で「高潔さ・気高さ」
ご参考まで！
カナダ 
