The word pensó is the preterite form of pensar in the third person singular.
See the full pensar conjugation

pensar

Este hombre pensó que tenía un mal caso de acidez.
This guy thought he had a bad case of heartburn.
Entonces pensó por un minuto... y se rascó la cabeza.
Then he thought for a minute... and scratched his head.
Porque Blair pensó que sería una buena idea por Lucy.
Because Blair thought it would be a good idea for Lucy.
Jojo encontró a Chris y pensó que Sia estaría implicada.
Jojo found Chris and thought that Sia would be implicated.
Paul pensó que podría tener salido temprano a la escuela.
Paul thought she might have gone off early to school.
El quinto capítulo describe pensó en esta etapa de su desarrollo.
The fifth chapter describes thought at this stage of its development.
Y usted pensó que sería el final de todo.
And you thought that would be the end of it.
Él pensó que los Ramones eran algún tipo de arte.
He thought the Ramones were some kind of art thing.
Él pensó que no deberíamos estar en el mismo vuelo.
He didn't think we should be on the same flight.
Ella pensó que era Sherri y Pam, en ese momento.
She believed that it was Sherri and Pam, at that time.
Pero pensó que tenía la luna en su mano.
But she thought she had the moon in her hand.
Cuando el director vio ese dibujo, pensó que era genial.
When the director saw that drawing, he thought it was great.
Leo pensó que el amuleto lo protegería de hombres lobos.
Leo thought that the amulet would protect him from werewolves.
Cómo pensó que ella haría lo mismo por él.
How he thought she would do the same for him.
¿Cinco años, y su esposo pensó que simplemente escapó?
Five years, and her husband thought she just ran away?
Y la víctima nunca pensó viviría para ver este día.
And the victim never thought he would live to see this day.
Quizá pensó que tenía un brillante futuro en la banda.
Maybe it thought I had a bright future in the gang.
Mi mujer pensó haber oído algo que venía del sótano.
My wife thought she heard something coming from the basement.
¿Y no pensó en compartir esa información con nosotros?
And you didn't think to share that information with us?
Ella pensó que tal vez quieras algunas cosas de tu casa.
She thought you might want some stuff from your house.
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