Original sentence: WWF claims to have a factual, science-based approach to conservation, which focuses on six priority issues of global concern: forests, oceans and coasts, fresh water, endangered species, and the insidious threats of toxic chemicals and climate change; some critics disagree with this claim
Edited sentence: WWF has a factual, science-based approach to conservation, which focuses on six priority issues of global concern: forests, oceans and coasts, fresh water, endangered species, and the insidious threats of toxic chemicals and climate change