An user Spanish
says…

El
Determiner
  presentador
Noun
  de
Adposition
  estas
Determiner
  demostraciones
Noun
  fue
Auxiliary
  el
Determiner
  actor
Noun
  William
Proper noun
 Holden.

The presenter of these demonstrations was actor William Holden.
Words and sentences
New
de

New
estas

New
demostraciones

plural of demostración

New
fue

  1. third-person singular preterite indicative of ir
  2. third-person singular preterite indicative of ser

New
el

masculine singular definite article; the

New
actor

actor (person who performs in a theatrical play or movie)

New
William

a male given name from English

New
presentador

  1. presenter
  2. host, hostess, master of ceremonies (for a performance etc.)

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