An user Spanish
says…

Están
Auxiliary
  todos
Pronoun
  enterrados
Adjective
  en
Adposition
  El
Determiner
  Escorial
Proper noun
.

The three were all buried at the El Escorial complex.
Words and sentences
New
están

third-person plural present indicative of estar

New
todos

masculine plural of todo

New
enterrados

New
en

  1. in, at, on
  2. in (a time)
  3. in (a language)
  4. used after some verbs and translated by various prepositions in English
  5. in (in various expressions)

New
el

masculine singular definite article; the

New
Escorial

El Escorial (a royal palace in Madrid)

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