Complex sentence: The Rio Hondo in the southern part of the state runs for approximately 8 miles from the confluence of the Rio Ruidoso and the Rio Bonito, through the town of Roswell, and then empties into the Pecos River.
Split into simpler sentences: The Rio Hondo begins at the confluence of the Rio Ruidoso and the Rio Bonita (Bonito?) in Southern New Mexico. It then flows through the town of Roswell, NM where it shortly empties into the Pecos River.