Original sentence: , qi, prana, or innate intelligence (Kaptchuk and Eisenberg 1998:1069)), is an untestable concept  "used as the basis of pseudoscientific health systems" (Williams 2000:367)
Edited sentence: , qi, prana, or innate intelligence (Kaptchuk and Eisenberg 1998:1069)), is an untestable concept [.] "used as the basis of pseudoscientific health systems" (Williams 2000:367)