Complex sentence: The fauna was dominated by tiered communities of suspension feeders, mainly with short food chains and the ecological system reached a new grade of complexity far beyond that of the Cambrian fauna, which has persisted until the present day.
Split into simpler sentences: The fauna was dominated by tiered communities of suspension feeders, mainly with short food chains. The ecological system reached a new grade of complexity far beyond that of the Cambrian fauna, which has persisted until the present day.