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
it is unlikely that this phrase will ever reach equilibrium