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はならなかった

did not become, did not turn into, had to

→ 成る
verb · informal, past tense Rare #44,873
did not become, did not turn into Often appears in the pattern ～にはならなかった, meaning that something did not become or result in something.
JA: 彼の努力は無駄にはならなかった。
EN: His efforts did not go to waste.
had to In the pattern ～なくてはならなかった, expresses obligation in the past.
JA: 昨日は早く帰らなくてはならなかった。
EN: I had to go home early yesterday.
Conjugation of 成る

我々の努力は成功という結果にはならなかった。

Our efforts did not result in success.

貧しい学歴が彼の出世の妨げとはならなかった。

His limited educational background did not prevent him from getting ahead.

数冊の案内書を買ったが、どれも私の助けにはならなかった。

I bought several guidebooks, but none of them were any help to me.