Complex sentence: DNA analysis also showed him at high risk of atherosclerosis, lactose intolerance, and the presence of the DNA sequence of "Borrelia burgdorferi", possibly making him the earliest known human with Lyme disease.
Split into simpler sentences: DNA analysis also showed him at high risk of atherosclerosis, lactose intolerance. The presence of the DNA sequence of "Borrelia burgdorferi", making him the earliest known human with Lyme disease.