Complex sentence: Nólsoy has one of the world's largest colonies of European storm petrels (50,000 pairs), and is also home to the first known wild population of common frogs in the Faroe Islands.
Split into simpler sentences: Nólsoy has one of the world's largest colonies of European storm petrels (50,000 pairs). Nólsoy is also home to the first known wild population of common frogs in the Faroe Islands.