Complex sentence: An Igbo Language, Summer Institute of Linguistics (1975) or 600,000 including the closely related to Ikwo, Ezza, and Mgbo, which form a dialect cluster known as Izi-Ezaa-Ikwo-Mgbo.
Split into simpler sentences: An Igbo Language, Summer Institute of Linguistics (1975). Izi is closely related to Ikwo, Ezza, and Mgbo, and the three are considered to form a dialect cluster known as Izi-Ezaa-Ikwo-Mgbo.