Sentence:  More than a beautiful visualization of the illustrious adventures and escapades of the tragi-comic knight-errant and his squire , Sancho Panza , in seventeenth century Spain , this inevitably abbreviated rendering of the classic satire on chivalry <WSD>is</WSD> an affectingly warm and human exposition of character . 
Meaning of the word marked with <WSD> tags:  have the quality of being; (copula, used with an adjective or a predicate noun)