Complex sentence: These are the Second Branch of the "Mabinogi" and "Culhwch and Olwen"; the first is the mythological tale of the giant Bran the Blessed and his sister Branwen, and the latter is an Arthurian romance also associated with the "Mabinogion".
Split into simpler sentences: These are the Second Branch of the "Mabinogi" and "Culhwch and Olwen". The first is the mythological tale of the giant Bran the Blessed and his sister Branwen, the latter is an Arthurian romance also associated with the "Mabinogion".