Complex sentence: Haplogroup R1b, also known as haplogroup R-M343, is the most frequently occurring Y chromosome haplogroup in Western Europe, as well as some parts of Russia (e.g. the Bashkir minority), and Central Africa (e.g. Chad and Cameroon).
Split into simpler sentences: Haplogroup R1b, also known as haplogroup R-M343, is a human Y-chrosome haplogroup. It is the most frequently occurring Y chromosome haplogroup in Western Europe, as well as some parts of Russia (e.g. the Bashkir minority), and Central Africa (e.g. Chad and Cameroon).