YOU SAID:

I'm surprised that you decided to come to the show

INTO JAPANESE

君がショーに来ることに決めたことに驚いた

BACK INTO ENGLISH

I was surprised that you decided to come to the show.

INTO JAPANESE

あなたがショーに来ることに決めたことに驚きました。

BACK INTO ENGLISH

I was surprised that you decided to come to the show.