Complex sentence: Her genetic makeup was determined to be 89% Sub-Saharan African, 8% Native American, and 3% East Asian; however, the East Asian may, given the imprecisions of genetic testing, actually be Native American markers.
Split into simpler sentences: Her genetic makeup was determined to be 89% Sub-Saharan African, 8% Native American, and 3% East Asian. However, the East Asian may, given the imprecisions of genetic testing, actually be Native American markers.