had been existing
-había estado existiendo
Past perfect progressiveconjugation ofexist.There are other translations for this conjugation.

exist

In the Andean region, in which later the Incan empire was erected, the village communities called Ayllus with their channels, their terraces and their developed agriculture had been existing for a long time before the Incas erected their rule.
En las regiones andinas, en las cuales más tarde se levantó el imperio Inca existieron las comunidades rurales, los Ayllus, con sus construcciones de canales, sus terrazas, y su avanzada agricultura, mucho antes que los Incas levantaran su dominio.
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