estuvieron pecando
-they/you were sinning
Preterite progressive ellos/ellas/ustedes conjugation of pecar.

pecar

Tampoco intentó afirmar la idea sin sentido que en un tiempo, cuando estuvieron pecando, sus almas estaban en un estado de aniquilación.
Neither did he intend to assert the nonsensical idea that at one time, while they were sinning, their souls were in a state of nonexistence.
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to season