YOU SAID:

I don't understand what the purpose of this utterly ostentatious application is.

INTO JAPANESE

この非常に派手なアプリケーションの目的が何であるかわかりません。

BACK INTO ENGLISH

I don't know what the purpose of this very flashy application is.

INTO JAPANESE

この非常に派手なアプリケーションの目的が何であるかはわかりません。

BACK INTO ENGLISH

I don't know what the purpose of this very flashy application is.