YOU SAID:

I'm going to be in the office tomorrow and will be back after lunch

INTO JAPANESE

私は明日オフィスに行き、昼食後に戻ってきます

BACK INTO ENGLISH

I will go to the office tomorrow and come back after lunch

INTO JAPANESE

明日オフィスに行って昼食後に帰ります

BACK INTO ENGLISH

I will go to the office tomorrow and return after lunch

INTO JAPANESE

明日オフィスに行って昼食後に帰ります

BACK INTO ENGLISH

I will go to the office tomorrow and return after lunch