Well I agree that the potential dividers can be removed and the gain reduced.
However, for educational purposes, here's how to convert it to a single supply with the potential dividers left in.
It's pretty simple, double the value of the resistor and use two, forming another potential divider across the power supply. This works because the impedance looking into a potential divider, is equal to both the divider impedances in parallel. I've rounded all the values to the nearest E24 value, for example for the 4.7k resistors, double that gives 9.4k, the nearest E24 value is 9.1k.
Another potential divider and a capacitor is added to all the other points of the circuit which are normally connected to 0V.