Complex sentence: The type of crystal was determined by examination of chlorite inclusions, and is only to be found in Madagascar and Brazil, and thus unobtainable or unknown within pre-Columbian Mesoamerica.
Split into simpler sentences: The type of crystal was determined by examination of chlorite inclusions. It is only found in Madagascar and Brazil, and thus unobtainable or unknown within pre-Columbian Mesoamerica.