Anthony is a teacher who teaches at a local school.
Anthony is a teacher that teaches at a district school.
"現地校のアンソニー先生"を関係代名詞を使って表現すると以下のようになります。
「Anthony is a teacher who works at a state school.」
「Anthony is a teacher who teaches at a local school.」
「Anthony is a teacher that teaches at a district school.」
「現地校」は state school、local school、district schoolとしています。
"現地校のアンソニー先生"を関係代名詞を使わずに文章中で表現するなら、
A local school teacher, Anthony says ~~~
のようになります。
I hope this will help you.
お役に立てば嬉しいです