The word ocurrían is the imperfect form of ocurrir in the third person plural.
See the full ocurrir conjugation

ocurrir

Y trabajaba en un sitio donde los milagros ocurrían.
And I was working in a place where miracles happen.
Antes del siglo veinte, casi todos los partos ocurrían en el hogar.
Before the 20th century, almost all births occurred at home.
Y trabajaba en un sitio donde los milagros ocurrían.
And I was working in a place where miracles happen.
Aquí había sucesos que ocurrían después del 29 de Abril.
There were events on here that occurred after April 29th.
No actúe como si no supiera las cosas que ocurrían, doctor.
Don't act like you didn't know things were going on, doctor.
Las masacres de mujeres, niños, y ancianos ocurrían con frecuencia.
Massacres of women, children, and the elderly occurred on a regular basis.
Las mutilaciones de animales ocurrían por todo el país.
Animal mutilations were occurring all over the country.
¿Y qué hacía cuando le ocurrían esas cosas?
And what would he do when things got like that?
En el pasado ocurrían siempre daños de cojinetes.
In the past bearing damage occurred time and again.
Es sorprendente, las cosas que ocurrían.
It's amazing, the things that went on.
Cuando yo estaba al frente, no ocurrían estas cosas.
When I was running things, nothing like this happened.
Durante esos seis meses ocurrían cosas realmente importantes en la vida de nuestros jóvenes.
During these six months, something important happens in the lives of our youth.
¿Quién podría creer que ocurrían esas cosas?
Who could believe such things were happening?
Por lo general, las respuestas indicaban que los incidentes relacionados con explosivos ocurrían con escasa frecuencia.
Generally, the responses indicated that explosive-related incidents occur relatively infrequently.
Cada vez que jugaba con la base se me ocurrían nuevos diseños.
Every time I toyed with the base I came up with new designs.
Se me ocurrían formas que nunca se habían usado.
I could see ways to use it that had never been used.
La tecnología moderna nos permitió a todos simultáneamente observar los acontecimientos cuando ocurrían.
Modern technology enabled all of us simultaneously to watch the events as they unfolded.
Siempre se le ocurrían maneras de hacerlo todavía mejor.
And he always tried to come up with ways to make it even better.
Antes, se me ocurrían un montón de ideas.
There was a time when I used to get lots of ideas.
La intensidad de las úlceras y la frecuencia con la cual ocurrían también se redujo.
The intensity of the ulcers and the frequency with which they occurred also reduced.
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