YOU SAID:

My father left and this made me very sad.

INTO JAPANESE

私の父は去りました、そしてこれは私をとても悲しくしました。

BACK INTO ENGLISH

My dad is gone, and this made me so sad.

INTO JAPANESE

お父さんがいなくなって、とても悲しくなりました。

BACK INTO ENGLISH

I was very sad because my dad was gone.

INTO JAPANESE

お父さんがいなくなったのでとても悲しかったです。

BACK INTO ENGLISH

I was very sad because my dad was gone.