instruction: Is the next sentence syntactically and semantically acceptable?

I polished the vase which was from India up.

response: unacceptable

instruction: Is the next sentence syntactically and semantically acceptable?

I think that learning English to be not all that easy.

response: unacceptable

instruction: Is the next sentence syntactically and semantically acceptable?

This John Smith lives in Seoul.

response: acceptable

instruction: Is the next sentence syntactically and semantically acceptable?

John saw more horses than Bill saw cows or Pete talked to cats.

response:
acceptable