Complex sentence: The largest protected area is the Sudd Wetland, which is an important bird life area spread over which is also a Ramsar Site which has 470 bird species, 100 mammal species and 100 fish species.
Split into simpler sentences: The largest protected area is the Sudd Wetland, which is an important bird life area spread over. It is also a Ramsar Site with 470 bird species, 100 mammal species and 100 fish species.