Complex sentence: Integral ecology is the application in the late 1990s of Ken Wilber's integral theory to environmental studies and ecological research by Sean Esbjörn-Hargens and environmental philosopher Michael E. Zimmerman.
Split into simpler sentences: Integral ecology is the application of Ken Wilber's integral theory to environmental studies and ecological research. The field was pioneered in the late 1990s by integral theorist Sean Esbjörn-Hargens and environmental philosopher Michael E. Zimmerman.