Complex sentence: More information is now known regarding the passive replacement of tissues in the human body, as well as the mechanics of stem cells; therefore, advances in research have enabled the induced regeneration of many more tissues and organs than previously thought possible.
Split into simpler sentences: More information is now known regarding the passive replacement of tissues in the human body, as well as the mechanics of stem cells. Advances in research have enabled the induced regeneration of many more tissues and organs than previously thought possible.