documentclass[xcolor=table,usenames,dvipsnames]{beamer}
mode<presentation> {
usetheme{Madrid}
}

usepackage{avm}
usepackage{adjustbox}

setbeamertemplate{caption}[numbered]
setbeamertemplate{navigation symbols}{}

begin{document}

begin{frame}{HPSG Matrix}

adjustbox{max width=textwidth}{
begin{avm}
[asort{some-raising-type}
synsem.local.cat.val & [ subj & < [ local.cont.hook.index & avmbox{1} ] > \
      comps & < [ local & [ cat.head & verb \
      cont.hook.xarg & avmbox{1} ] ] > ] ]
end{avm}
}

end{frame}

end{document}