If you know how to do it for parallel elements and you know how to do it for series elements, then you know how to do it for these. The one on the left is the series combination of two components. One of those components just happens to be the parallel combination of two components. So find the phasor for the parallel combination of the resistor and the inductor. Now use that in your determination of the series combination of that and the capacitor.
Take your best shot at it and post your work. Then we can discuss further.