Complex sentence: The trade and cultural interactions between each of these Tlingit groups and their disparate neighbors, the differences in food harvest practices, and the dialectical differences contribute to these identifications, which are also supported by similar self-identifications among the Tlingit.
Split into simpler sentences: The trade and cultural interactions between each of these Tlingit groups and their disparate neighbors, the differences in food harvest practices, and the dialectical differences contribute to these identifications. The classifications are supported by similar self-identifications among the Tlingit.