had supervened
Past perfectconjugation ofsupervene.There are other translations for this conjugation.

supervene

Pius XI was not unaware of the fact that in the forty years that had supervened since the publication of the Leonine encyclical the historical scene had altered considerably.
No olvidó, sin embargo, Pío XI que, a lo largo de los cuarenta años transcurridos desde la publicación de la encíclica de León XIII, la realidad de la época había experimentado profundo cambio.
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