YOU SAID:

I am your father's brother's cousin's nephew's son-in-law's niece's sister-in-law's brother's mother's brother-in-law's son's former roommate.

INTO JAPANESE

私はあなたの父の兄弟のいとこの甥の息子の姪の姪の義理の兄弟の兄弟の母の義理の兄弟の息子の元ルームメイトです。

BACK INTO ENGLISH

I am a former roommate of your father's brother's cousin's nephew's son's niece's niece's brother-in-law's brother's mother's brother-in-law's son.

INTO JAPANESE

私はあなたの父の兄弟のいとこの甥の息子の姪の姪の姪の兄弟の兄弟の母の義理の兄弟の息子の元ルームメイトです。

BACK INTO ENGLISH

I'm a former roommate of your father's brother's cousin's nephew's son's niece's niece's niece's brother's mother's brother-in-law's son.

INTO JAPANESE

私はあなたの父の兄弟のいとこの甥の息子の姪の姪の姪の兄弟の母の義理の兄弟の息子の元ルームメイトです。

BACK INTO ENGLISH

I'm a former roommate of your father's brother's cousin's nephew's son's niece's niece's niece's brother's mother's brother-in-law's son.