The word nacieron is the preterite form of nacer in the third person plural.
See the full nacer conjugation

nacer

Lo que Krishna dice es que las almas nunca nacieron.
What Krishna says is that the souls are never born.
La mitad de tus votantes nacieron en México, David.
Half of your voters were born in Mexico, David.
Todos los hombres del mundo nacieron de una mujer.
All men in the world were born from a woman.
Estos son los principios que nacieron en aquella época.
These are the principles which were born in that time.
Mis padres nacieron en Corea, una nación devastada por la guerra.
My parents were born in Korea, a nation devastated by war.
Hector no ha estado en Grecia desde que sus hijos nacieron.
Hector hasn't been to Greece since his children were born.
Liak y ella nacieron en el mismo pueblo.
Liak and she were born in the same village.
Más del 13% de los residentes nacieron en el extranjero.
More than 13% of all residents were born abroad.
Mis padres nacieron y crecieron en Eslovaquia, la antigua Checoslovaquia.
My parents were born and raised in Slovakia, former czechoslovakia.
La suma de los años en que nacieron fue.
The sum of the years in which they were born was.
Muchos de estos niños no nacieron en Vietnam.
Many of these children were not born in Vietnam.
Los tipos como tú no nacieron para vivir siguiendo las reglas.
Guys like you weren't born to live by the rules.
Algunos de mis predecesores nacieron en esta región.
Some of my predecessors were born in this area.
De sus tierras nacieron los hombres y las mujeres indestructibles.
From these lands were born indestructible men and women.
Cuando nacieron, No tenía ni idea de qué hacer .
When they were born, I had no idea what to do.
Pero sí sé esto, estos dos nacieron para ser espías.
But I do know this, these two were born to be spies.
Las Naciones Unidas nacieron de la necesidad y de los ideales.
The United Nations was born out of necessity and ideals.
Como usted sabe, mis hijos nacieron fuera del matrimonio.
As you know, my sons were both born out of wedlock.
No estaba tan feliz en el día en que nacieron.
I wasn't this happy on the day you were born.
Ellos nacieron como una reacción a los malos gobiernos.
They were born as a response to bad governments.
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