Complex sentence: In 1831, Leopardi wrote "Il pensiero dominante" ("The Dominating Thought"), which exalts love as a living or vitalizing force in itself, even when it is unrequited.
Split into simpler sentences: In 1831, Leopardi wrote "Il pensiero dominante" ("The Dominating Thought"). This poem exalts love as a living or vitalizing force in itself, even when it is unrequited.