YOU SAID:

the dog went to the park and then pooped

INTO JAPANESE

犬は公園に行って、それからうんちをした

BACK INTO ENGLISH

The dog went to the park and then pooped.

INTO JAPANESE

犬は公園に行き、それからうんちをした。

BACK INTO ENGLISH

The dog went to the park, and then pooped.

INTO JAPANESE

犬は公園に行き、それからうんちをした。

BACK INTO ENGLISH

The dog went to the park, and then pooped.