YOU SAID:

I'm so happy he's been more active lately.

INTO JAPANESE

彼が最近もっと活発になっていることをとてもうれしく思います。

BACK INTO ENGLISH

I am very pleased that he has become more active lately.

INTO JAPANESE

彼が最近もっと活発になったことをとてもうれしく思います。

BACK INTO ENGLISH

I am very pleased that he has become more active lately.