had been rearing
Past perfect progressiveconjugation ofrear.There are other translations for this conjugation.

rear

It would bring them into collision with their religious teachers; for it would involve the overthrow of the whole structure which for generations the rabbis had been rearing.
Los pondría en oposición con los maestros de su religión, porque derribaría el edificio entero que durante generaciones habían ido edificando los rabinos.
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