Complex sentence: Today, the valley is known as Teton Basin or Teton Valley, and in 1832 was irrevocably assigned a historic place, as the site of the infamous events in the Battle of Pierre's Hole (below).
Split into simpler sentences: Today, the valley is known as Teton Basin or Teton Valley. In 1832 it was designated a historic place as the site of the infamous events in the Battle of Pierre's Hole (below).