YOU SAID:

My mom died while looking out the window

INTO JAPANESE

窓の外を見ながら母が死亡しました。

BACK INTO ENGLISH

My mother has died while looking out of the window.

INTO JAPANESE

彼は座って窓の外を眺めていました。

BACK INTO ENGLISH

He sat looking out of the window.

INTO JAPANESE

彼は座って窓の外を眺めていました。

BACK INTO ENGLISH

He sat looking out of the window.