YOU SAID:
yesterday, after school, i went to the park to play.
INTO JAPANESE
昨日、学校が終わった後、私は公園に遊びに行きました。
BACK INTO ENGLISH
After school yesterday, I went to the park to play.
INTO JAPANESE
昨日の放課後、私は公園に遊びに行きました。
BACK INTO ENGLISH
After school yesterday, I went to the park to play.
That didn't even make that much sense in English.