Complex sentence: In reality, there is no evidence (stumps, historical accounts) that any significant logging took place, nor does the relatively wide extent of the stands and the great variety of age groups support a tree-planting theory.
Split into simpler sentences: In reality, there is no evidence (stumps, historical accounts) that any significant logging took place. Nor does the relatively wide extent of the stands and the great variety of age groups support a tree-planting theory.