YOU SAID:

The rider sat upon the back of ones steed

INTO JAPANESE

ものスティードの後ろに座っていたライダー

BACK INTO ENGLISH

One rider was sitting in the back of the Steed

INTO JAPANESE

1 つのライダー、馬の後ろに座っていた

BACK INTO ENGLISH

Was sitting behind one rider and horse

INTO JAPANESE

1 つのライダーと馬の後ろに座っていた

BACK INTO ENGLISH

Was sitting behind one rider and horse