The quote in the question is from Mario Vargas Llosa, from his book The Truth of Lies.

The sentences “No other discipline or branch of the arts can substitute for literature in crafting the language that people need to communicate.”, “Without it (literature), the critical mind, which is the real engine of historical change and the best protector of liberty, would suffer an irreparable loss.” and “…this world without literature, this nightmare that I am delineating, would have as its principal traits conformism and the universal submission of humankind to power.” contain, respectively, relative clauses of the following types