Complex sentence: While historically most health data has been sourced from this framework, the advent of health information technology and the eHealth paradigm have expanded the collection and use of health data--but have also engendered new security, privacy, and ethical concerns.
Split into simpler sentences: While historically most health data has been sourced from this framework, the advent of health information technology and the eHealth paradigm have expanded the collection and use of health data. These trends have also, however, engendered new security, privacy, and ethical concerns.