Complex sentence: The sea cow was named after Georg Wilhelm Steller, a naturalist who discovered the species in 1741, on Vitus Bering's Great Northern Expedition when the crew became shipwrecked on Bering Island.
Split into simpler sentences: The sea cow was named for Georg Wilhelm Steller, a naturalist who discovered the species in 1741. The discovery came on Vitus Bering's Great Northern Expedition when the crew became shipwrecked on Bering Island.