%%%------------------------------------------------------------------------------------------------------------

\begin{center}
\begin{tikzpicture}

\tikzstyle{wnode}=[inner sep=0mm,minimum height=1.5em,minimum width=2em]
{\small
\begin{scope}[sibling distance=15pt, level distance = 30pt]

\Tree[.\node(n1){{S}};
        [.\node(n2){{NP}}; \node(w1){{Jane}};]
        [.\node(n3){{VP}};
            [. \node(w2){had};]
            [. \node(n4){NP}; \node(w3){{a cat}};]
            ]
        [. \node(w4){.};]
     ]

\end{scope}
}

{\small
\begin{scope}[xshift=1in,yshift=-0.7in]

\node [anchor=west] (n1) at (0.5em,0em) {(Root(S(NP Jane)NP(VP had(NP a cat)NP)VP .)S)Root};

\draw [->,very thick] ([xshift=-2.3em,yshift=0em]n1.west) -- ([xshift=-0.5em,yshift=0em]n1.west);

\end{scope}
}

\end{tikzpicture}
\end{center}