hubieran relajado
-they/you had relaxed
Past perfect subjunctiveellos/ellas/ustedesconjugation ofrelajar.

relajar

Después de los primeros decenios de gran fervor, es probable que los cristianos se hubieran relajado un poco y que no se tomaran ya muy en serio los compromisos de su bautismo.
Probably, after the first few decades of great fervor, the Christians were a bit more relaxed and did not take seriously the commitments of their baptism.
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