Simplify the following text for a Grade 9 native English-speaking person.
Original: In a peer reviewed medical journal , one medical scientist published that Japanese acupuncture is â far less painfulâ than Chinese acupuncture , and that Japanese acupuncture needles are smaller than Chinese acupuncture needles .
Simplified: Acupuncture is an ancient kind of medical treatment in which thin metal needles are pushed into different parts of the body . Acupuncture was developed by the Chinese about 5,000 years ago .