YOU SAID:

I am to the left of Richard, but to the right of Robin.

INTO JAPANESE

リチャードの左がロビンの右側にいます。

BACK INTO ENGLISH

Richard's left is on the right side of Robin.

INTO JAPANESE

リチャードの左はロビンの右側です。

BACK INTO ENGLISH

Richard's left is Robin's right side.

INTO JAPANESE

リチャードの左はロビンの右サイドです。

BACK INTO ENGLISH

Richard's left is Robin's right side.