Complex sentence: Walker, who has been the the professor of Australian Studies at Deakin University since 1991, is a leading authority in the field of Australian images of Asia and this work is the culmination of several years of his research and observation.
Split into simpler sentences: Walker, who has been the the professor of Australian Studies at Deakin University since 1991, is a leading authority in the field of Australian images of Asia. This work is the culmination of several years of his research and observation.