How to draw multiseries donut chart using d3.js - d3.js

Question

I am trying to implement donut chart with multiple series (ex:2) using the d3.js library.
I need to use json data as source.
Any Idea how to do this.
This is the source code, i used for donut chart:
var width = 800,
height = 400,
radius = Math.min(width, height) / 2;
var color = d3.scale.ordinal()
.range(["#98abc5", "#8a89a6", "#7b6888"]);
var arc = d3.svg.arc()
.outerRadius(radius - 70)
.innerRadius(radius - 120);
var pie = d3.layout.pie()
.sort(null)
.value(function (d) { return d.Count; });
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height)
.append("g")
.attr("transform", "translate(" + width / 2 + "," + height / 2 + ")");
var jsondata = [{ "id": 1,"age": 5, "population": 2704659 }, { "id": 2, "age": 7, "population": 4499890 }, { "id": 3, "age": 8, "population": 2159981 }];
data = jsondata;
d3.json('talent/data', function (error, data) {
console.log(data);
var g = svg.selectAll(".arc")
.data(pie(data))
.enter().append("g")
.attr("class", "arc");
g.append("path")
.attr("d", arc)
.style("fill", function (d) { return color(d.data.Name); });
g.append("text")
.attr("transform", function (d) { return "translate(" + arc.centroid(d) + ")"; })
.attr("dy", ".35em")
.style("text-anchor", "middle")
.text(function (d) { return d.data.Name; });
});
</script>
Multi-series donut chart like : http://www.jqplot.com/tests/pie-donut-charts.php