\documentclass{standalone}
\usepackage{tikz-dependency}

\begin{document}
% In the preamble:

% In the document:
\begin{dependency}[theme = simple]
   \begin{deptext}[column sep=1em]
      Will \& spotted \& Bigfoot \& outside \& the \& Medical \& Library \\
   \end{deptext}
   \deproot{2}{ROOT}
   \depedge{2}{1}{NSUBJ}
   \depedge{2}{3}{DOBJ}
   \depedge{2}{7}{NMOD}
   \depedge{7}{6}{AMOD}
   \depedge{7}{5}{DET}
   \depedge{7}{4}{CASE}
\end{dependency}
\end{document}
