This allows current to flow through your telephone circuit because those little "buttons" in the cr adle are spring-loaded and they come up, closing a switch.
(those little "buttons" in the cr adle; are; spring-loaded) (they; come up; closing a switch) (they; closing; a switch) (This; allows; current to flow through your telephone circuit)
those little "buttons" in the cr adle they they This
are come up closing allows
spring-loaded
closing a switch
a switch
current to flow through your telephone circuit