The Portuguese were the first Westerners to come to Japan.
The first Western people to arrive in Japan were Portuguese.
ーThe Portuguese were the first Westerners to come to Japan.
「ポルトガル人が最初に日本に来た西洋人でした」
the first Westerners to come to Japan で「最初に日本に来た西洋人」
ーThe first Western people to arrive in Japan were Portuguese.
「最初に日本に来た西洋人はポルトガル人でした」
the first Western people to arrive in Japan で「最初に日本に到着した西洋人」
ご参考まで！
カナダ 
