First of all I have re-drawn the circuit to make is clear how the connections are made to the sensor. Secondly, he may not have connected the lower divider to 0v and that's why the circuit is not dividing.
Thirdly we know nothing about the sensor and I have increased the impedance of the output as 1k5 load may be too low.
Fourthly, the sensor may work on 5v and this will make the circuit easier to design.
Fifthly, it is absolutely important that English is written and understood in these dialogues. Uver wise et es veri dificult too now wat de over persin is talking abut.