Propulsion is from the hand/foot lever pulling on bicycle chain to a one-way ratcheting chainwheel driving the rear axle's left wheel.
(Propulsion; is; from the hand/foot lever) (the hand/foot lever; pulling; on bicycle chain; to a one-way ratcheting chainwheel) (a one-way ratcheting chainwheel; driving; the rear axle's left wheel)
Propulsion the hand/foot lever a one-way ratcheting chainwheel
is pulling driving
from the hand/foot lever
on bicycle chain to a one-way ratcheting chainwheel
the rear axle's left wheel