Complex sentence: In 1974 David Holmgren moved to Tasmania to study Environmental Design at the Tasmanian College of Advanced Education, where he studied landscape design, ecology and agriculture and, during a close association with Bill Mollison, developed the Permaculture concept.
Split into simpler sentences: In 1974 David Holmgren moved to Tasmania to study at the Tasmanian College of Advanced Education in the Dept. of Environmental Design. In the alternative education environment there he chose to study landscape design, ecology and agriculture and, during a close association with Bill Mollison, developed the Permaculture concept.