Que ha visto a los espectros

[Tyrn]

Hi,

(QUE HA VISTO A LOS ESPECTROS QUE
HEMOS VISTO A LOS ESPECTROS ELLOS
NOSOTROS TÚ HAS VISTO A LOS ESPECTROS)

(HE SEES THE GHOSTS WE SEE THE GHOSTS THEY WE YOU SEE THE GHOSTS—)

Why que?

UPD:

It looks like a reference to this:

¡E insiste, infausto, que ha visto a los espectros!

...and still insists he sees the ghosts!


My condolences to the translator

[AngelicaDeAlquezar]

"Que" is a linking word.
He insists that he has seen the ghosts.
Él insiste (en) que ha visto a los espectros.

When there is no previous sentence, "que" may be used to mark an emphasis.