Complex sentence: In 2005, Asher became an activist in the deep ecology movement, an eco-philosophy based on the idea that all life is of intrinsic value, irrespective of its value to human beings, and that humans have no right to interfere with nature except for essential needs.
Split into simpler sentences: In 2005, Asher became an activist in the deep ecology movement. Deep ecology is an eco-philosophy based on the idea that all life is of intrinsic value, irrespective of its value to human beings, and that humans have no right to interfere with nature except for essential needs.