The word eran is the imperfect form of ser in the third person plural.
See the full ser conjugation

ser

Su rehabilitación y reintegración en la sociedad eran sumamente difíciles.
Their rehabilitation and reintegration in the society were extremely difficult.
Sus enfrentamientos con el alcalde y su esposa eran notorios.
Their clashes with the mayor and his wife were notorious.
Elimelec y su familia eran de la ciudad de Belén.
Elimelech and his family were from the town of Bethlehem.
Mi hermana y Kelvin eran muy felices juntos, buenos amigos.
My sister and Kelvin were so happy together, best friends.
El salario y las condiciones de trabajo eran muy buenos.
The salary and the conditions of work were very good.
Esos chicos eran una pérdida de tiempo desde el principio.
These guys were a waste of time from the start.
Cuando tenía mi edad, las cosas eran diferentes para Papá.
When he was my age, things were different for Pop.
En España los seguidores de Franco eran las camisas azules.
In Spain the followers of Franco were the blue shirts.
Esta es la cima, y esas elecciones eran mi oportunidad.
This is the top, and that election was my shot.
En mi sueño, sus barcos eran hundidos por una tormenta.
In my dream, his boats were sunk in a storm.
La aventura y el suspense eran muy importantes para él.
The adventure and the suspense was very important to him.
Resulta que ocho de los Daniels eran en realidad Danielles.
Turns out that eight of the Daniels were actually Danielles.
Los animales bajo el agua no eran sujetos de adoración.
The animals under the water were not subjects of worship.
Los regalos que había dado a Rebeca eran muy valiosos.
The gifts he had given to Rebecca were very valuable.
Sabemos que tú y tu compañero eran solo la fuerza.
We know you and your partner were just the muscle.
Durante los primeros años, nuestras vidas eran sencillas y felices.
In the early years, our lives were simple and happy.
Pero estas no eran las principales preocupaciones de mi día.
But these were not the major preoccupations of my day.
Los clientes eran muy pesados, todo el día de pie.
The clients were very heavy, all the day standing up.
Esto significa que 25% eran para una misión ad extra.
That means that 25% were to a mission ad extra.
Dado que eran muy jóvenes para trabajar en la ciudad.
Since they were too young to work in the city.
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