Complex sentence: People have been living in the Berkhamsted area for over 5,000 years, including evidence of flint working in the Neolithic period and metal working in the late Iron Age and Roman periods.
Split into simpler sentences: People have been living in the Berkhamsted area for over 5,000 years. There is evidence of flint working in the Neolithic period and metal working in the late Iron Age and Roman periods.