Complex sentence: Sverdrup Island belongs to the Krasnoyarsk Krai administrative division of Russia and is part of the Great Arctic State Nature Reserve--the largest nature reserve of Russia and one of the biggest in the world.
Split into simpler sentences: Sverdrup Island belongs to the Krasnoyarsk Krai administrative division of the Russian Federation. It is also part of the Great Arctic State Nature Reserve--the largest nature reserve of Russia and one of the biggest in the world.