An example of using tikz to generate a figure. Use `pdflatex file_name.tex` to compile, where `file_name.tex` is the name of this file. It should create an image directly in the text. Note that the package assumptions are minimal.

tikz example

\documentclass[11pt]{article}
\usepackage{amsmath,amssymb,tikz}
\usetikzlibrary{positioning}

\begin{document}

\begin{center}
\begin{tikzpicture}
\node (1)  [align=center]                  {$\mathsf{EXPSPACE}$};
\node (2)  [align=center, below=3mm of 1]  {$\mathsf{MA}_{\mathsf{EXP}}$};
\node (3)  [align=center, below=3mm of 2]  {$\mathsf{NEXP}$};
\node (4)  [align=center, below=3mm of 3]  {$\mathsf{EXP}$};
\node (5)  [align=center, below=3mm of 4]  {$\mathsf{PSPACE}$};
\node (6)  [align=center, below=3mm of 5]  {$\mathsf{P}^{\mathsf{\#P}}$};
\node (7)  [align=center, below=3mm of 6]  {$\mathsf{PH}$};
\node (8)  [align=center, below=3mm of 7]  {$\mathsf{NP}^{\mathsf{NP}}$};
\node (9)  [align=center, below=3mm of 8]  {$\mathsf{MA}$};
\node (10) [align=center, below=3mm of 9]  {$\mathsf{NP}$};
\node (11) [align=center, below=3mm of 10]  {$\mathsf{P}$};
\node (12) [align=center, below=3mm of 11] {$\mathsf{NLOGSPACE}$};
\node (13) [align=center, below=3mm of 12] {$\mathsf{LOGSPACE}$};

\node (14) [align=center, right=20mm of 7] {$\mathsf{PP}$};
\node (15) [align=center, below=6mm of 14] {$\mathsf{BQP}$};
\node (16) [align=center, below=6mm of 15] {$\mathsf{BPP}$};

\node (17) [align=center, right=20mm of 14] {$\mathsf{P/poly}$};
\node (18) [align=center, below=3mm of 17]  {$\mathsf{NC}^{1}$};
\node (19) [align=center, below=3mm of 18]  {$\mathsf{TC}^{0}$};
\node (20) [align=center, below=3mm of 19]  {$\mathsf{ACC}$};
\node (21) [align=center, below=3mm of 20]  {$\mathsf{AC}^{0}\left[\mathsf{p}\right]$};
\node (22) [align=center, below=3mm of 21]  {$\mathsf{AC}^{0}$};

\draw [line width=1.0pt] (1)  edge (2);
\draw [line width=1.0pt] (2)  edge (3);
\draw [line width=1.0pt] (3)  edge (4);
\draw [line width=1.0pt] (4)  edge (5);
\draw [line width=1.0pt] (5)  edge (6);
\draw [line width=1.0pt] (6)  edge (7);
\draw [line width=1.0pt] (7)  edge (8);
\draw [line width=1.0pt] (8)  edge (9);
\draw [line width=1.0pt] (9)  edge (10);
\draw [line width=1.0pt] (10) edge (11);
\draw [line width=1.0pt] (11) edge (12);
\draw [line width=1.0pt] (12) edge (13);

\draw [line width=1.0pt] (6) edge (14);
\draw [line width=1.0pt] (9) edge (14);
\draw [line width=1.0pt] (9) edge (16);
\draw [line width=1.0pt] (11) edge (16);

\draw [line width=1.0pt] (14) edge (15);
\draw [line width=1.0pt] (15) edge (16);

\draw [line width=1.0pt] (16) edge (17);
\draw [line width=1.0pt] (17) edge (18);
\draw [line width=1.0pt] (18) edge (19);
\draw [line width=1.0pt] (19) edge (20);
\draw [line width=1.0pt] (20) edge (21);
\draw [line width=1.0pt] (21) edge (22);
\end{tikzpicture}
\end{center}

\end{document}