His parents trusted in his magical talents so they gave him a tutor to help him hone his skills.
この場合、次のような言い方ができますよ。
ーHis parents trusted in his magical talents so they gave him a tutor to help him hone his skills.
「彼の両親は彼の魔法の才能を見込んで、彼のスキルを磨くのを助けるため家庭教師をつけた」
to trust in his magical talents で「彼の魔法の才能を見込む」
to give him a tutor で「家庭教師をつける」
to hone one's skillsで「技術を磨く」
ご参考まで!