Complex sentence: The peaks of the Andes in this area reach heights of over 6,000 meters (19,500 feet), and the "Puna" (or Altiplano), a 3,500-meter high plateau, extends north into Bolivia.
Split into simpler sentences: The peaks of the Andes in this area reach heights of over 6,000 meters (19,500 feet). Below these, a 3,500-meter high plateau, known as the "Puna" (or Altiplano), extends north well into Bolivia.