Complex sentence: The second section gives the names of the "populi Albenses": these were local communities which inhabited the region of "Mons Albanus" (now Monte Cavo) and its immediate surroundings, the Alban Hills.
Split into simpler sentences: The second section gives the names of the "populi Albenses". These were local communities inhabiting the region of "Mons Albanus" (now Monte Cavo) and its immediate surroundings, the Alban Hills.