He kept his daughter in charge of his slaves.

英訳に間違いが有れば正してください。

彼は娘に奴隷を担当させた。
He kept his daughter in charge of his slaves.

ヒント
in charge

答え keptをleft, putにする

He left(put) his daughter in charge of his slaves.

left, put+目的語+in charge
目的語に任せる、担当させる