Complex sentence: Logging practices have altered the majority of the native forests, transforming them into simplified forests of same-aged trees with a reduced ecological resilience, especially prone to catastrophic fire and mortality due to beetle infestation and disease.
Split into simpler sentences: Logging practices have altered the majority of the native forests, transforming them into simplified forests of same-aged trees with a reduced ecological resilience. These disturbed stands are especially prone to catastrophic fire and mortality due to beetle infestation and disease.