had been concentrating
Past perfect progressiveconjugation ofconcentrate.There are other translations for this conjugation.

concentrate

The Ministry of Health, in response to public demand, had been concentrating on primary health care.
El Ministerio de Salud, atendiendo a una demanda pública, ha centrado sus esfuerzos en la atención primaria de la salud.
Mariano had been concentrating on small detailed paintings but Manuel Reanda persuaded him to work on large canvases, and this change pushed Mariano in to his particular area of strength.
Mariano se había concentrado en pinturas pequeñas, detalladas, pero Manuel Reanda lo convenció de trabajar en lienzos grandes, y este giro empujó a Mariano hacia su fuerte particular.
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