Complex sentence: Haplogroup R1a, or haplogroup R-M420, is a Y DNA haplogroup which is distributed in a large region in Eurasia, extending from South Asia and southern Siberia to Central Europe and Scandinavia.
Split into simpler sentences: Haplogroup R1a, or haplogroup R-M420, is a common Y DNA haplogroup in many parts of Eurasia. R1a is distributed in a large region extending from South Asia and southern Siberia to Central Europe and Scandinavia.