Complex sentence: The structure of the organization created the most apparent point of dispute, because it was created with the intention of representing a large number of sometimes disparate non-governmental organizations, but could not necessarily claim to be representative of all the bands and nations in Canada.
Split into simpler sentences: The structure of the organization created the most apparent point of dispute. It was created with the intention of representing a large number of sometimes disparate non-governmental organizations, but could not necessarily claim to be representative of all the bands and nations in Canada.