YOU SAID:

my window was open so i killed my hamster

INTO JAPANESE

私の窓が開いていたので、ハムスターを殺しました

BACK INTO ENGLISH

I killed the hamster because my window was open

INTO JAPANESE

窓が開いていたのでハムスターを殺しました

BACK INTO ENGLISH

I killed the hamster because the window was open

INTO JAPANESE

窓が開いていたのでハムスターを殺しました

BACK INTO ENGLISH

I killed the hamster because the window was open