Vertaling van "réponses devaient parvenir " (Frans → Engels) :

Leurs réponses devaient donc parvenir à la Commission une fois qu’elles auraient eu la possibilité de consulter tous les documents de Matrix liés au litige du Royaume-Uni, mais avant que les documents liés aux litiges parallèles ne deviennent disponibles, à savoir pendant la période courant entre le 9 et le 14 janvier 2013.
Their responses were thus due after they had had the opportunity to see all Matrix documents related to the UK litigation but before the documents related to other parallel litigation had been made accessible, i.e., in the period between 9 and 14 January 2013.

Je crois comprendre que les réponses devaient parvenir au plus tard le 31 mars 2002.
My understanding is that the responses were to be in by March 31, 2002.