Complex sentence: The Yazidi (also, "Yezdi", "Ezidy") are mostly a Kurdish-speaking ethnoreligious group and to some sources Yazidis are Kurds and have a Kurdish culture.
Split into simpler sentences: The Yazidi (also, "Yezdi", "Ezidy") are mostly a Kurdish-speaking ethnoreligious group. According to some sources Yazidis are Kurds and have a Kurdish culture.