Complex sentence: In particular since the discovery of mitochondrial DNA as a method to map the movements of Mankind's genetic groups within time scales, genetic tests within Ireland conducted in 2004 confirm the Celtic theory is genetically unfounded.
Split into simpler sentences: In particular since the discovery of mitochondrial DNA as a method to map the movements of Mankind's genetic groups within time scales. Such genetic tests within Ireland conducted in 2004 confirm the Celtic theory is genetically unfounded.