had been erecting
-había estado erigiendo
Past perfect progressiveconjugation oferect.There are other translations for this conjugation.

erect

Copán had been erecting monuments for 250 years before Quirigua, and both cities apparently ceased within five years of each other.
Copán había estado erigiendo monumentos por 250 años antes de Quirigua, y aparentemente ambas ciudades dejaron de existir con 5 años de diferencia.
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