Complex sentence: The survivors of this tragic episode divided into two groups: the Great-Lake Wyandots and the Huron-Wendat, who were the ancestors of the Huron-Wendat of Wendake.
Split into simpler sentences: The survivors of this tragic period divided into two groups: the Great-Lake Wyandot and the Huron-Wendat. The latter were the ancestors of the Huron-Wendat of Wendake.