Complex sentence: Whatever the origin, the word "Malacañang" is indisputably Tagalog; even during the Spanish Colonial Era, Spanish language books published during the era spelled the word as "Malacañang" (not "Malacañán").
Split into simpler sentences: Whatever the origin, the word "Malacañang" is indisputably Tagalog. During the Spanish Colonial Era, Spanish language books published during the era spelled the word as "Malacañang" (not "Malacañán").