I have a path as seen in this screenshot:
After "release compound path", I have multiple path segments superimposed on each other:
Ho can I make one path from several paths?
Select the paths and press ctrl+J, this will join the anchor points and give you one path.
If you have duplicates on top of each other you can select all of them then shift click the top one to deselect it and press delete to remove the underlying ones. Then use the above to connect the paths together.