YOU SAID:

Ian is studying at home for math when his mother slapped him in his face

INTO JAPANESE

イアンが家で数学の勉強をしていると、母親がイアンの顔を平手打ちした

BACK INTO ENGLISH

Ian's mother slapped him in the face while he was home studying math.

INTO JAPANESE

イアンが家で数学を勉強している間、母親はイアンの顔を平手打ちした。

BACK INTO ENGLISH

His mother slapped Ian in the face while he was home studying math.

INTO JAPANESE

彼が家で数学を勉強している間、彼の母親はイアンの顔を平手打ちした。

BACK INTO ENGLISH

His mother slapped Ian in the face while he was home studying math.