The word pudo is the preterite form of poder in the third person singular.
See the full poder conjugation

poder

Esta cosa pudo haber estado evolucionando por millones de años.
This thing could have been evolving for millions of years.
En Babylon, el culto de Jehová pudo haber sido olvidado.
In Babylon, the cult of Jehovah might have been forgotten.
MacPherson pudo haber enterrado un artefacto y reasfaltado la carretera.
MacPherson could have buried an artifact and repaved the road.
Pero esto no pudo haber pasado en un peor momento.
But this could not have happened at a worse time.
El OSACT no pudo concluir su examen de la cuestión.
The SBSTA could not conclude its consideration of the issue.
Mira, nuestro amigo pudo haber perdido su sensatez en prisión.
Look, our friend might have lost his wits in prison.
Pero cuando Ness fue atrapado, no pudo hacer el trabajo.
But when Ness got caught, he couldn't do the job.
Amor para ver lo que pudo hacerlo en la piscina.
Love to see what he could do in the pool.
Conociendo la ley, José pudo hacer una de tres decisiones.
Knowing the law, Joseph could make one of three choices.
No pudo hallar un corazón y luchó por tres años.
He couldn't find a heart and struggled for 3 years.
Pero no es la peor cosa que pudo haber sucedido.
But it's not the worst thing that could have happened.
Ella trató de conseguir el buen Scrooge, pero no pudo.
She tried to get the good Scrooge, but could not.
Bueno, entonces no pudo haber sido el responsable del ataque.
Well, then he couldn't have been responsible for the attack.
La única persona que pudo haber hecho esto es Lucas.
The only person who could have done this is Lucas.
Bueno, esto no pudo haber ocurrido en un peor momento.
Well, this couldn't have happened at a worse possible time.
Cuando pasaron el edificio, Kaneka pudo ver a su objetivo.
When they passed the building, Kaneka could see his target.
Durante un año no pudo encontrar ni rastro de él.
For a year he couldn't find any trace of him.
No pudo encontrar un hombre hasta tarde en la vida.
She couldn't find a man till late in life.
Pero esto no pudo haber pasado en un peor momento.
But this could not have happened at a worse time.
Él pudo estar con ella el resto de la noche.
He could've been with her the rest of the night.
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