The word pensaban is the imperfect form of pensar in the third person plural.
See the full pensar conjugation

pensar

Bien, dije que los matemáticos pensaban que esto era imposible.
Now, I said that mathematicians thought that this was impossible.
Ese matrimonio no era tan feliz como todos pensaban.
That marriage was not as happy as everyone thought.
He preguntado que pensaban de usted, y no le conocen.
I asked who thought of you, and do not know.
Walter y William Bell pensaban que esos niños tenían capaciadades extrasensoriales.
Walter and William bell thought that children had extrasensory capabilities.
En cuanto a mis padres, no sé lo que ellos pensaban.
As for my parents, I don't know what they thought.
Estoy seguro de que Tom y Lynette pensaban lo mismo.
Yeah, I'm sure Tom and Lynette felt the same way.
Pueden ver cómo se compara esto con lo que pensaban.
You can see how this relates to what you thought.
Además, todos pensaban que Cole estaba fuera de la ciudad.
Plus everyone thought Cole was out of town.
Ellos pensaban que mis amigos eran una mala influencia.
They thought my friends were a bad influence.
Por suerte, los creadores de la Internet, pensaban como yo.
Thankfully, the creators of the Internet thought with me.
Y ellos hicieron lo que pensaban era correcta en ese momento.
And they did what they thought was right at the time.
Bien, ¿por qué pensaban que estábamos en problemas?
Well, why did you think we were in trouble?
Los padres de Leo pensaban que Clara era demasiado mayor para él.
Leo's parents thought that Clara was too old for him.
Lo que realmente pensaban de mi, Nunca lo sabré.
What they really thought of me, I shall never know.
Algunos pensaban que la radiación podía venir del sol.
Some thought that the radiation might come from the Sun.
Está probando ser más duro de lo que todos pensaban.
He is proving to be much tougher than everyone expected.
Siempre odiaste escuchar lo que los demás pensaban de ti.
You always hated hearing what people thought about you.
Oh, ellos pensaban que podías estar sobre mí.
Oh, they thought you might be on to me.
Eso, al menos, era lo que pensaban los Briga.
That, at least, was the thinking of the Briga.
No importa lo que el mundo está a punto hablaban o pensaban.
No matter what the world is about they spoke or thought.
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