Complex sentence: During that period began studying many medical practices and became qualified in naturopathy, osteopathy, and chiropractic, but dissatisfied with Western approaches also began travelling and studying non-Western medical practices.
Split into simpler sentences: During that period he began studying several different medical practices and became qualified in naturopathy, osteopathy, and chiropractic. Dissatisfied with Western approaches also began travelling and studying non-Western medical practices.