connection problem between the wire and the circuit

hello
I'm doing the circuit in the attached picture and I do not understand the connection between the wire and the circuit for the sensor tmp36 a 3 pin (gnd pin, pin analog pine v +) and there are only 2 wires used in the shielded wire and there are 3 (2 inner wire and a wire multibrain outside). can you explain how the physical connection between the two?

thank you in advance for ideas!
Emmanuelle

tmp36.jpg