YOU SAID:

uncle jack was off his horse

INTO JAPANESE

ジャックおじさんは馬から降りていた

BACK INTO ENGLISH

Uncle Jack was getting off his horse

INTO JAPANESE

ジャックおじさんが馬から降りていた

BACK INTO ENGLISH

Uncle Jack was dismounting from his horse

INTO JAPANESE

ジャックおじさんは馬から降りていた

BACK INTO ENGLISH

Uncle Jack was getting off his horse

INTO JAPANESE

ジャックおじさんが馬から降りていた

BACK INTO ENGLISH

Uncle Jack was dismounting from his horse