Complex sentence: During his career, McKeen has advocated integration of eastern and western medical approaches, encouraging western medicine to study oriental approaches; when he has addressed international meetings of acupuncturists, he has urged cooperation with western medicine.
Split into simpler sentences: During his career, McKeen has advocated integration of eastern and western medical approaches, encouraging western medicine to study oriental approaches. When he has addressed international meetings of acupuncturists, he has urged cooperation with western medicine.