Complex sentence: The hills, especially around the shores of the lakes, have been popular since prehistoric times, from the 9th to 7th century BC there were numerous villages (see the legendary Alba Longa and Tusculum).
Split into simpler sentences: The hills, especially around the shores of the lakes, have been popular since prehistoric times. From the 9th to 7th century BC there were numerous villages (see the legendary Alba Longa and Tusculum).