Complex sentence: In immunology, organ harvesting is a surgical procedure that removes organs or tissues for reuse, such as in organ transplantation, which is mired in ethical debate and heavily regulated, but has largely become an accepted medical practice.
Split into simpler sentences: In immunology, organ harvesting is a surgical procedure that removes organs or tissues for reuse, such as in organ transplantation,. It is mired in ethical debate and heavily regulated, but has largely become an accepted medical practice.