Complex sentence: Azd Mecca are one of four branches of Azd (Al-Azd), a major pre-Islamic tribes, a branch of Kahlan which was one of the branches of Qahtan the other being Himyar.
Split into simpler sentences: Azd Mecca are one of four branches of Azd (Al Azd) one of the major pre-Islamic tribes. They were a branch of Kahlan which was one of the branches of Qahtan the other being Himyar.