YOU SAID:
I didn't think you could do that thing that is a cool thing to do it at.
INTO JAPANESE
私はあなたがそれを行うにはクールなことを行うことができるとは思わなかった。
BACK INTO ENGLISH
I never thought you could do a cool thing to do it.
INTO JAPANESE
私はあなたがそれを行うためにクールなことをすることができるとは思わなかった。
BACK INTO ENGLISH
I never thought you could do a cool thing to do it.
That didn't even make that much sense in English.