You should use the command sgml2docs to process your SGML
documents. See sgml2docs
for detailed documentation, or give the command
sgml2docs --help for a quick summary.
The sgml2docs option --jadeflags allows you to do
some limited customisation of the output. See Appendix E.1.3.2. There are some groups of Jade flags
which can more conveniently be set using options, using the
--options argument. The LaTeX output has options
cts-sect (do not start a new page with each new section),
cts-appx (same, for appendices), and onepass (produce
output which needs only a single pass through LaTeX, which means
that the table-of-contents ends up printed last, requiring trivial
rearrangement).