YOU SAID:

I gave him a vegimite sandwich

INTO JAPANESE

私は彼の vegimite のサンドイッチを与えた

BACK INTO ENGLISH

I gave the vegimite of him sandwiches.

INTO JAPANESE

私は彼の vegimite のサンドイッチを与えた。

BACK INTO ENGLISH

I gave the vegimite on his sandwich.

INTO JAPANESE

彼のサンドイッチに、vegimite を与えた。

BACK INTO ENGLISH

Gave the vegimite on his sandwich.

INTO JAPANESE

彼のサンドイッチに、vegimite を与えた。

BACK INTO ENGLISH

Gave the vegimite on his sandwich.