14 Caiaphas was the one who had advised the Jewish leaders that it would be good if one man died for the people.

Read John 18:14 Using Other Translations

Now Caiaphas was he, which gave counsel to the Jews, that it was expedient that one man should die for the people.
It was Caiaphas who had advised the Jews that it would be expedient that one man should die for the people.
Caiaphas was the one who had told the other Jewish leaders, “It’s better that one man should die for the people.”