Complex sentence: The Uncompahgre Ute Indians from central Colorado are one of the first documented groups of people in the world known to utilize the effect of mechanoluminescence through the use of quartz crystals to generate light, likely hundreds of years before the modern world recognized the phenomenon.
Split into simpler sentences: The Uncompahgre Ute Indians from central Colorado are one of the first documented groups of people in the world known to use the effect of mechanoluminescence. They used quartz crystals to generate light, likely hundreds of years before the modern world recognized the phenomenon.