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のを待っていた

was waiting for

→ の
phrase Rare #20,656
was waiting for The pattern verb + のを待つ means “to wait for someone or something to do something.” 待っていた is the past progressive form, “was waiting.”
JA: 彼女が来るのを待っていた。
EN: I was waiting for her to come.

何時間も君が現れるのを待っていたんだぞ。

I've been waiting for hours for you to show up.

トムはレッカー車が来るのを待っていた。

Tom was waiting for the tow truck to arrive.

トムは、自分の夢が叶うのを待っていた。

Tom was waiting for his dream to come true.

彼らは門が開くのを待っていた。

They were waiting for the gate to open.