Complex sentence: Further problems with the environment arose when a vast algal bloom appeared in one-fifth of Lake Okeechobee in 1986, the same year cattails were discovered overtaking sawgrass marshes in Loxahatchee National Wildlife Refuge.
Split into simpler sentences: Further problems with the environment arose when a vast algal bloom appeared in one-fifth of Lake Okeechobee in 1986. The same year cattails were discovered overtaking sawgrass marshes in Loxahatchee National Wildlife Refuge.