Baseball classes taught by an ex-professional baseball player are planned to be held at my local elementary school.
Baseball classes taught by a former professional baseball player are planned to be held at a nearby elementary school.
質問ありがとうございます。
こう言えますよ、
❶Baseball classes taught by an ex-professional baseball player are planned to be held at my local elementary school.
(元プロ野球選手が教える野球教室が地元の小学校で開催される予定です)。
❷Baseball classes taught by a former professional baseball player are planned to be held at a nearby elementary school.
(元プロ野球選手が教える野球教室が近くの小学校で開催される予定です)。
*どこの小学校で開催されるかをはっきり述べたるならもっと自然な文章が作れます。
例えば、地元の小学校、近所の小学校、私の小学校、など…
それが一度限りの野球教室なら、
A baseball class which will be taught by an ex-professional baseball player is planned to be held at my local elementary school. と言いましょう〜
*baseball classes 野球の授業
* taught (teach に過去形) 教えられる
* ex- profesional/ former 元
* baseball player 野球選手
*Planned 予定されている
* To be held 開催される
参考に!