YOU SAID:
I ate an apple with my grandma today so I’m going back for lunch
INTO JAPANESE
今日はおばあちゃんとリンゴを食べたので、昼食に戻ります
BACK INTO ENGLISH
I ate apples with my grandma today, so I'm going back for lunch
INTO JAPANESE
今日はおばあちゃんとリンゴを食べたので、昼食に戻ります
BACK INTO ENGLISH
I ate apples with my grandma today, so I'm going back for lunch
That didn't even make that much sense in English.