Complex sentence: Auskerry is designated a Special Protection Area due to its importance as a nesting area for Arctic Tern and Storm Petrel; 4.2% of the breeding population of Storm Petrel in Great Britain nest on the island.
Split into simpler sentences: Auskerry is designated a Special Protection Area due to its importance as a nesting area for Arctic Tern and Storm Petrel. At least 4.2% of the breeding population of Storm Petrel in Great Britain nest on the island.