Convert Spline to lines and Arcs

If you have a spline and want to convert it to arcs and lines, us this option:

Insert -> Curve from Curves -> Simplify

UPDATE
Starting with a Spline

I used the studio spline available under “Insert -> Curve -> Studio Spline”. Picked four points and ok on the dialog.

Now we have one spline. To break it up into arcs and lines, use the “Insert -> Curve from Curves -> Simplify” option. Pick the option you want to have happen. In this case I’m selecting delete the original curve and only leave me the new simplified spline. Select the spline and ok. What you are left with is a line that is made up of lines and arcs depending on what is the simplest geometry to get the same curve.