Complex sentence: Human societies began transforming terrestrial ecology more than 50 000 years ago, and evolutionary evidence has been presented demonstrating that the ultimate causes of human transformation of the biosphere are inherently social and cultural, not biological, chemical, or physical.
Split into simpler sentences: Human societies began transforming terrestrial ecology more than 50 000 years ago. Evolutionary evidence have been presented demonstrating that the ultimate causes of human transformation of the biosphere are inherently social and cultural, not biological, chemical, or physical.