YOU SAID:

There once was a ship that was on sea

INTO JAPANESE

かつて海上を航行していた船がありました

BACK INTO ENGLISH

There was once a ship that sailed on the sea

INTO JAPANESE

かつて海を航行する船がありました

BACK INTO ENGLISH

Once upon a time there was a ship that sailed the sea

INTO JAPANESE

むかしむかし、海を航行する船がありました

BACK INTO ENGLISH

Once upon a time there was a ship that sailed the sea