I have to take mandatory training to renew my XX license every three years.
この場合、次のような言い方ができますよ。
ーI have to take mandatory training to renew my XX license every three years.
「3年ごとにXXの資格を更新するために、必須の研修を受けなければいけない」
to take mandatory training「必須の・義務の研修を受ける」
to renew my XX license「XXの資格・免許を更新する」
every three years「3年ごとに」
ご参考まで!
I am required to undergo training for the renewal of my certification every three years.
I have to undergo required training to renew my certification every three years.
ご質問ありがとうございます。
・「I am required to undergo training for the renewal of my certification every three years.」
「I have to undergo required training to renew my certification every three years.」
(意味)3年ごとの資格更新たのめに規定の研修を受ける
<例文>I am required to undergo training for the renewal of my certification every three years. So next week I'll be going to Tokyo.
<訳>3年ごとの資格更新たのめに規定の研修を受ける。 そのため来週東京へ行く。
参考になれば幸いです。