Hi Cliff,
I've attempted to explain a little bit about how tellsimpafter
works on this wiki page:
http://maxima.sf.net/wiki/index.php/User-defined%20simplification
I don't know how successful I've been, but there you have it.
Take a look and let me know if that does or doesn't help.
Probably after that page gets worked over a bit I will copy
some of it into the texinfo documentation, as the coverage
of simplification could be expanded.
For what it's worth,
Robert Dodier
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