His conclusion was influenced by the discoveries that she had a criminal record.

英訳に間違いが有れば正してください。

彼の結論は彼女が犯罪歴を持っていたという事実の発見によって影響を受けた。
His conclusion was influenced by the discoveries that she had a criminal record.

ヒント
同格のthatが使われている

答え discoveryと単数にする

His conclusion was likely influenced by the discovery that she had a criminal record.

同格のthatの前の名詞は単数