Complex sentence: The Quirinal Palace (known in Italian as the Palazzo del Quirinale or simply the "Quirinale") is the official residence of the President of the Italian Republic on the Quirinal Hill, the tallest of the seven hills of Rome.
Split into simpler sentences: The Quirinal Palace (known in Italian as the Palazzo del Quirinale or simply the "Quirinale") is the official residence of the President of the Italian Republic. The palazzo is situated on the Quirinal Hill, the tallest of the seven hills of Rome.