From that day on refers to the time that Caiaphas spoke to the Jewish Council (verses 49-50). In order to make this fact explicit, it may be necessary, as in New American Bible, to indicate that verses 51-52 are a parenthetical statement by the author of the Gospel. Or one may introduce verse 53 by translating “So from the day that Caiaphas spoke to the Jewish Council, they made plans to kill Jesus.”

In Greek the Jewish authorities is literally “they,” while Jesus is literally “him.” Again Good News Translation makes pronominal references explicit.

Made plans to kill Jesus may be translated “were planning to kill Jesus” or “were planning how they could kill Jesus.”

Quoted with permission from Newman, Barclay M. and Nida, Eugene A. A Handbook on the Gospel of John. (UBS Handbook Series). New York: UBS, 1980. For this and other handbooks for translators see here .