had been founding
-había estado fundando
Past perfect progressiveconjugation offound.There are other translations for this conjugation.

found

She found a website for ACTA, an organization the Colorado Chapter of which Governor Owens and Senator Hank Brown had been founding members.
Encontró el portal de ACTA, una organización cuya filial de Colorado tiene como miembros fundadores al gobernador Owens y al senador Hank Brown.
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