YOU SAID:

im going down to the store and buying McDonald's on the way back

INTO JAPANESE

店に行って帰りにマクドナルドを買うつもりです

BACK INTO ENGLISH

I'm going to go to the store and buy McDonald's on the way home.

INTO JAPANESE

帰りにお店に行ってマクドナルドを買うつもりです。

BACK INTO ENGLISH

I'm going to go to the store and buy McDonald's on the way home.