YOU SAID:

i went to the store to buy some milk then went home

INTO JAPANESE

私はミルクを買うために店に行き、それから家に帰った

BACK INTO ENGLISH

I went to the store to buy milk, and then I went home.

INTO JAPANESE

私は牛乳を買うために店に行き、それから家に帰った。

BACK INTO ENGLISH

I went to the store to buy milk, and then I went home.