Complex sentence: The portrait "Equestrian Portrait of Elisabeth of France" was painted by Velázquez of Elisabeth of France "circa" 1635, originally for the Salón de Reinos and now in the Prado since the gallery's institution in 1819.
Split into simpler sentences: The portrait "Equestrian Portrait of Elisabeth of France" was painted by Velázquez of Elisabeth of France "circa" 1635, originally for the Hall of Realms. It has been in the Prado since the gallery's institution in 1819.