Complex sentence: The Navajo or Navaho (or "Naabeehó") of the Southwestern United States are the largest federally recognized tribe in the United States with 300,048 enrolled tribal members as of 2011.
Split into simpler sentences: The Navajo or Navaho (or "Naabeehó") are a Native American people of the Southwestern United States. They are the largest federally recognized tribe in the United States with 300,048 enrolled tribal members as of 2011.