YOU SAID:
He was aware that he was still a child
INTO JAPANESE
彼はまだ子供だったことを知っていました
BACK INTO ENGLISH
I knew he was still a kid
INTO JAPANESE
彼はまだ子供だった
BACK INTO ENGLISH
He was still a child
INTO JAPANESE
彼はまだ子供だった
BACK INTO ENGLISH
He was still a child
That didn't even make that much sense in English.