Original sentence: Acupuncture has been the subject of active scientific research since the late 20th century, and its effects and application have been rejected by Western medical researchers and clinicians.Because it is a procedure, the design of controlled studies is challenging, as with surgical and other procedures
Edited sentence: Acupuncture has been the subject of active scientific research since the late 20th century, and its effects and application remain controversial among Western medical researchers and clinicians.Because it is a procedure rather than a pill, the design of controlled studies is challenging, as with surgical and other procedures