they had multiplied
-avaient multiplié
Past perfect they conjugation of multiply.

multiply

With legal charges brought against them by the families of victims of the September 11, 2001 attacks, the airline companies claimed that even if they had multiplied the number of safety measures, the attacks would have succeeded anyway.
Poursuivies en Justice par des familles de victimes des attentats du 11 Septembre 2001, les compagnies d’aviation ont fait valoir que, même si elles avaient multiplié les mesures de sécurité, les attentats auraient réussi.
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