Complex sentence: Liceo Stellini's library is very prestigious: it contains two manuscripts from the 15th century, twelve incunables and hundreds of books from the 16th to 19th centuries.
Split into simpler sentences: Liceo Stellini's library is very prestigious: it contains books of the 15th, 16th, 17th and 18th century. The library contains two manuscripts from the 15th century, twelve incunables and hundreds of books from the 16th to 19th centuries.