Complex sentence: The inferior belly of the Omohyoideus divides the posterior triangle of the neck into an upper or occipital triangle and a lower or subclavian triangle, while its superior belly divides the anterior triangle into an upper or carotid triangle and a lower or muscular triangle.
Split into simpler sentences: The inferior belly of the Omohyoideus divides the posterior triangle of the neck into an upper or occipital triangle and a lower or subclavian triangle. Its superior belly divides the anterior triangle into an upper or carotid triangle and a lower or muscular triangle.