Complex sentence: McGraw-Hill, New York, USA The near-global system of 64 large marine ecosystems has a partial biogeographic basis, while the World Wildlife Fund identified 43 priority marine ecoregions as part of its Global 200 efforts.
Split into simpler sentences: McGraw-Hill, New York, USA The near-global system of 64 large marine ecosystems has a partial biogeographic basis. WWF identified 43 priority marine ecoregions as part of its Global 200 efforts.