YOU SAID:

the fact is that when I went to a party the bull went to the store

INTO JAPANESE

事実は、私がパーティーに行ったとき、雄牛が店に行ったということです

BACK INTO ENGLISH

The fact is that the bull went to the store when I went to the party

INTO JAPANESE

事実は、私がパーティーに行ったときに雄牛が店に行ったということです

BACK INTO ENGLISH

The fact is that the bull went to the store when I went to the party