The vibrating diaphragm causes the air molecules in the stethoscope tubes to vibrate, and the tubes carry the sound vibrations to the listener's ear.
(The vibrating diaphragm; causes; the air molecules in the stethoscope tubes to vibrate) (the tubes; carry; the sound vibrations; to the listener's ear)
The vibrating diaphragm the tubes
causes carry
the air molecules in the stethoscope tubes to vibrate
the sound vibrations to the listener's ear