Complex sentence: The Yazidi people speak Kurmanji Kurdish and adhere to the religion Yazidism, a branch of Yazdânism which is a pre-Islamic, native religion of the Kurds.
Split into simpler sentences: The Yazidi people speak Kurmanji Kurdish and adhere to the religion Yazidism. It is also believed that Yazisidism is a branch of Yazdânism, the pre-Islamic, native religion of the Kurds.