Complex sentence: The Pecos gambusia ("Gambusia nobilis") is a species of fish in the Poeciliidae family endemic to the Pecos River in Texas and New Mexico in the United States.
Split into simpler sentences: The Pecos gambusia ("Gambusia nobilis") is a species of fish in the Poeciliidae family. It is endemic to the Pecos River in Texas and New Mexico in the United States.