Complex sentence: Unwilling to return to society after Brian's death, Ned admits he has been living in secret in the wilderness ever since he then announces that he's heading deeper into the Shoshone to find a new campsite and that Henry shouldn't follow him.
Split into simpler sentences: Unwilling to return to society after Brian's death, Ned admits he has been living in secret in the wilderness ever since. He then announces that he's heading deeper into the Shoshone to find a new campsite and that Henry shouldn't follow him.