had been sabotaging
-había estado saboteando
Past perfect progressive conjugation of sabotage. There are other translations for this conjugation.

sabotage

Only a few months ago, I learned from David Icke's site that Kelly had been sabotaging his work too, after he had come in with the offer to help.
Hace solo unos meses, comprendí desde el sitio de David Icke que Kelly había estado saboteando su trabajo también, después de que había llegado con el ofrecimiento de ayuda.
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