Complex sentence: Frost is not uncommon in some mountainous cities such as Teresópolis, Nova Friburgo and Petrópolis and snow has been reported occasionally in the Itatiaia National Park.
Split into simpler sentences: Frost is not uncommon in some mountainous cities, such as Teresópolis, Nova Friburgo and Petrópolis. Snow has already been reported in some occasions in the Itatiaia National Park.