Complex sentence: Stemming from the alternative medicine system osteopathy, the anatomical focus of Zero Balancing is the human skeleton and key joints of the skeleton categorized as "foundation" and "semi-foundation joints".
Split into simpler sentences: Stemming from the alternative medicine system osteopathy, the anatomical focus of Zero Balancing is the human skeleton and its bony articulations (joints). Zero Balancers focus on key joints of the skeleton categorized as "foundation" and "semi-foundation joints".