彼が戻るまで

until he returns

→ 彼
phrase Rare #41,119
until he returns 彼が means “he,” 戻る means “to return,” and まで marks the time limit or endpoint. The phrase can also mean “until he comes back.”
JA: 彼が戻るまでここで待っていてください。
EN: Please wait here until he returns.

彼が戻るまで決定できない

We can't make a decision until he returns.

彼が戻るまで待とう

Let's wait until he comes back.

彼が戻るまで私はここで待ちます

I’ll wait here until he comes back.

彼が戻るまで待つんだ

Wait until he comes back.

— 預言者 (2009)