Complex sentence: What is found is that MW has a negative affect on text comprehension in more difficult readings thereby confirming with the executive-resource hypothesis where both task related and task unrelated thoughts (TUT) compete for executive function resources.
Split into simpler sentences: What is found is that mind-wandering has a negative affect on text comprehension in more difficult readings. This supports the executive-resource hypothesis which describes that both task related and task unrelated thoughts (TUT) compete for executive function resources.