The word renacieron is the preterite form of renacer in the third person plural.
See the full renacer conjugation

renacer

¿Cuál será su procedimiento en la familia donde renacieron?
What is its procedure in the family which is reborn?
El (re)descubrimiento de esas ranas de barro significa, en un sentido Maya, que renacieron en este mundo.
The (re)discovery of these clay frogs means, in a Maya sense, that they were reborn in this world.
Gracias a ellos la paz y la prosperidad renacieron de las cenizas de la angustia y el antagonismo.
They raised the phoenix of peace and prosperity from the ashes of anguish and antagonism.
Torremolinos y la Costa del Sol renacieron a partir de 1950 como un destino privilegiado.
Torremolinos and the Costa del Sol were born in the late 1950 as a favourite place as a tourist destination.
El libro ofrece también todos los textos de los recientes acuerdos firmados entre la Santa Sede y los Estados de la Europa central y oriental, que después de 1990 renacieron a la libertad.
The new text offers in particular all the texts of recent agreements, stipulated between the Holy See and the States of central and eastern Europe, which were regained their freedom after 1990.
Con esta reunión, las esperanzas de una solución al conflicto renacieron.
With this meeting, the hopes of a solution to the conflict have revived.
Nuestras esperanzas renacieron cuando vimos que llegaban refuerzos.
Our hopes soared when we saw reinforcements arrive.
Renacieron las esperanzas de paz en Somalia cuando la Conferencia de Reconciliación Nacional del país concluyó satisfactoriamente en octubre de 2004 con el establecimiento de un Gobierno Federal de Transición con sede en Nairobi.
Hopes were rekindled for peace in Somalia after the Somali National Reconciliation Conference concluded successfully in October 2004 with the formation of a Transitional Federal Government based in Nairobi.
Want to Learn Spanish?
Spanish learning for everyone. For free.
SpanishDict Premium
Have you tried it yet? Here's what's included:
Cheat sheets
No ads
Learn offline on iOS
Fun phrasebooks
Learn Spanish faster
Support SpanishDict