ellos hubiesen

had

u ˈb j e s e n → haber
hubi have + esen they/you all imperfect subjunctive
auxiliary · third plural · subjunctive Rare #31,654
had Pluperfect subjunctive (ellos/ellas/ustedes); used with a past participle.
SP: Era importante que ellos hubiesen llegado a tiempo.
EN: It was important that they had arrived on time.
Conjugation of haber

Hubiesen encontrado algo en la fábrica.

They would have found something in the factory.

Si me hubiesen pedido una cita los esperaba con un café.

If they had asked me for a date, I would have waited for them with a coffee.

— El secreto de sus ojos (2009)

Si me hubiesen hecho caso todavía estarían vivos.

If they had listened to me, they would still be alive.

— Reservoir Dogs (1992)

Es como si hubiesen caído en un hoyo.

It's as if they had fallen into a hole.

— El salario del miedo (1953)

Ustedes hubiesen hecho lo mismo.

You would have done the same.

— El hombre de la Tierra (2007)

Tom y Mary no hubiesen hecho eso si John no se lo hubiese pedido.

Tom and Mary wouldn't have done that if John hadn't asked them to.

Como si los últimos dos hubiesen sido importantes.

As if the last two had been important.

— El quinto elemento (1997)

Quién sabe qué idiota le hubiesen enviado.

Who knows what idiot they would have sent him.

— El submarino (Das Boot) (1981)

Le hubiesen encantado.

He would have loved them.

— El hombre de la Tierra (2007)

Sounds similar to