had intermingled
Past perfectconjugation ofintermingle.There are other translations for this conjugation.

intermingle

The leaders also transferred this behavior to Earth humans with whom they had intermingled in the past to create human descendants of various types.
Los líderes transfirieron también este comportamiento a los humanos de la Tierra, con quienes se habían entremezclado en el pasado para crear descendientes humanos de diversos tipos.
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