YOU SAID:

i went to the party and brought a horse

INTO JAPANESE

私はパーティーに行き、馬を連れて行った

BACK INTO ENGLISH

I went to a party and took the horses

INTO JAPANESE

私はパーティーに行き、馬を連れて行きました

BACK INTO ENGLISH

I went to the party and took my horse

INTO JAPANESE

私はパーティーに行き、私の馬に乗った

BACK INTO ENGLISH

I went to the party and got on my horse

INTO JAPANESE

私はパーティーに行き、私の馬に乗りました

BACK INTO ENGLISH

I went to the party and got on my horse