Complex sentence: The Pima are the likely descendants of the Hohokam, a culture noted for its extensive irrigation works which persisted for more than 1,000 years in the Gila and Salt river valleys of Arizona.
Split into simpler sentences: The Pima are the likely descendants of the Hohokam, an agricultural culture noted for its complex and extensive irrigation systems. The Hohokam persisted for more than 1,000 years in the Gila and Salt river valleys of Arizona.