we had tightened
-avions tendu
Past perfect we conjugation of tighten.

tighten

The difficulty is that, back in 1999, when we discovered a problem in Belgium, we thought then that we had tightened up our rules sufficiently so that there would not be another incident.
Le problème, c'est qu'en 1999, lorsque nous avons identifié une faille en Belgique, nous avons pensé avoir suffisamment renforcé nos règles pour qu'un accident de ce type ne puisse pas se répéter.
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