Ken, there are a several ways to do complex curves in SketchUp. One would be to simply combine circular arcs and line segments to create the shape. Another would be to use the Bezier plugin. A third would be a combination of the two.
Keep in mind that you can scale individual elements--arcs, Bezier curves--if needed.
After creating the complex curve but prior to running Follow Me or Push/Pull, use the Weld plugin to weld the segments together and save yourself a bunch of softening work after the extrusion.
Irony: The opposite of Wrinkly