dificultasen
-they hindered
The word dificultasen is the imperfect subjunctive form of dificultar in the third person plural.
See the full dificultar conjugation

dificultar

Sin embargo, ha expresado su preocupación ante la falta de coordinación entre las necesidades, el personal y el reglamento financiero de la Agencia y, en especial, por el hecho de que los procedimientos de selección dificultasen la contratación de personal debidamente cualificado.
However, it expressed concern about the lack of coordination between the needs, staff and financial regulation of the Agency and, in particular, that staff selection procedures made it difficult to recruit appropriately qualified personnel.
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