Complex sentence: The bioresonance diagnosis was complemented by the practitioner's dietary suggestions, making for an uncontrolled experiment with no analytical methods; it's measuring methods were the subjective analysis of the practitioner pre and post diagnosis.
Split into simpler sentences: The bioresonance diagnosis was complemented by the practitioner's dietary suggestions, making for an uncontrolled experiment with no analytical methods. The only measuring methods present were the subjective analysis of the practitioner pre and post diagnosis.