YOU SAID:
I went to the shop and bought a coffee
INTO JAPANESE
私は店に行き、コーヒーを買った
BACK INTO ENGLISH
I went to the store and bought a cup of coffee
INTO JAPANESE
私は店に行って、一杯のコーヒーを買って
BACK INTO ENGLISH
I went to the store and bought a cup of coffee
That didn't even make that much sense in English.