When you remove the ``UNSPLITTABLE`` could you edit the above to read

```
Sometimes autosimplification during sympification results in expressions that
are very different in structure than what was entered. Until such autosimplification
is no longer done, the ``kernS`` function might be of some use. In the example
below you can see how an expression reduces to -1 by autosimplification, but
does not do so when ``kernS`` is used.
```