YOU SAID:

that that thing that took that hat spoke in some unknown language that only that thing could understand

INTO JAPANESE

その帽子を取ったものは、そのことだけが理解できる未知の言語で話した

BACK INTO ENGLISH

The one who took the hat spoke in an unknown language that only that could be understood.

INTO JAPANESE

帽子を取った人は、それだけが理解できる未知の言語で話しました。

BACK INTO ENGLISH

The person who took the hat spoke in an unknown language that only could be understood.

INTO JAPANESE

帽子を取った人は、しか理解できない未知の言葉で話しました。

BACK INTO ENGLISH

The person who took the hat spoke in unknown words that only could be understood.

INTO JAPANESE

帽子を取った人は、理解できる未知の言葉でしか話しませんでした。

BACK INTO ENGLISH

The person who took the hat spoke only in understandable and unknown words.

INTO JAPANESE

帽子を取った人は、理解できる未知の言葉でしか話しませんでした。

BACK INTO ENGLISH

The person who took the hat spoke only in understandable and unknown words.