のは明白

it is obvious that

→ の
phrase Rare #24,777
it is obvious that のは turns the preceding clause into the thing being described; 明白 means “obvious” or “clear.”
JA: 彼がここに来たのは明白だ。
EN: It’s obvious that he came here.

彼が誤りを犯したのは明白だ。

It is obvious that he made a mistake.

彼が間違っているのは明白だ。

It’s obvious that he’s wrong.

誰かが間違ってそのお金を持っていったのは明白だった。

It was obvious that someone had taken the money by mistake.

何かを隠しているのは明白です

It’s obvious that they’re hiding something.

— レベッカ (1940)

クマが犯人なのは明白奴が消えた方が街は平和だ

It’s obvious the bear is the culprit. The town would be more peaceful if that guy disappeared.

— パディントン2 (2017)

これを貴方が私の為にしたくないのは明白です。

It's obvious that you don't want to do this for me.

その二人の女性が互いをよく知っているのは明白だった。

It was obvious that the two women knew each other well.