had been retarding
-había estado retardando
Past perfect progressive conjugation of retard. There are other translations for this conjugation.

retard

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It is an excellent time to bring to light the psychological defects of each that had been retarding the development of the relationship.
Es por tanto un momento excelente para sacar a la luz defectos del carácter psicológico de cada uno que habían sido una carga para el desarrollo de la pareja.
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