renacerían
-they would be reborn
The word renacerían is the conditional form of renacer in the third person plural.
See the full renacer conjugation

renacer

Si estar despierto durante la noche es una garantía para la liberación, todo el personal de enfermería del hospital, todos los conductores de trenes y todos los vigilantes renacerían en el reino de los cielos.
If being awake in the night is a guarantee for liberation, all hospital nursing staff, all railway engine drivers, and all watchmen would find a birth in the Kingdom of Heaven.
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