Complex sentence: The Chihuahua (Southeastern) tradition (? 6000 BC to c. AD 250) as a culture of south-central New Mexico and Chihuahua is still poorly defined and probably includes several local adaptations that evolved over long periods of time.
Split into simpler sentences: The Chihuahua (Southeastern) tradition (? 6000 BC to c. AD 250) as a culture of south-central New Mexico and Chihuahua is still poorly defined. It probably includes several local adaptations that evolved over long periods of time.