Complex sentence: The site of Crustumerium has been known since the 19th century, located in the hills of the park (Riserva Naturale) of Marcigliana Vecchia, to the north of Rome near Settebagni, on the Via Salaria.
Split into simpler sentences: The site of Crustumerium has been known since the 19th century. It is located in the hills of the (Riserva Naturale) park of Marcigliana Vecchia, to the north of Rome near Settebagni, on the Via Salaria.