ellos hubiesen

had

u ˈb j e s e n → haber
hubi have + esen they/you all imperfect subjunctive
auxiliary · 3rd-person plural Rare #39,329
had Used as an auxiliary to form the past perfect subjunctive.
SP: Ojalá hubiesen llegado a tiempo.
EN: I wish they had arrived on time.
Conjugation of haber

Es como si hubiesen caído en un hoyo.

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

— El salario del miedo (1953)

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)

Le hubiesen encantado.

He would have loved them.

— El hombre de la tierra (2007)

Quién sabe qué idiota le hubiesen enviado.

Who knows what idiot they would have sent him.

— El Submarino (1981)

Como si los últimos dos hubiesen sido importantes.

As if the last two had been important.

— El Quinto Elemento (1997)

Ustedes hubiesen hecho lo mismo.

You would have done the same.

— El hombre de la tierra (2007)

Si me hubiesen hecho caso todavía estarían vivos.

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

— Perros de Reserva (1992)

Hubiesen encontrado algo en la fábrica.

They would have found something in the factory.

Sounds similar to