Complex sentence: Pre-Incan cotton grave cloths were found in Huaca Prieta in Peru, and date back to 2500 BCE, and cotton was mentioned in Hindu hymns in 1500 BCE.
Split into simpler sentences: Pre-Incan cotton grave cloths were found in Huaca Prieta in Peru, and date back to 2500 BCE. Cotton was mentioned in Hindu hymns in 1500 BCE.