%%
%% The LaTeX Companion, 3ed
%%
%% Example 6-7-3 on page I-477 in "multirow --- Vertical alignment in tables".
%%
%% Copyright (C) 2022 Frank Mittelbach
%%
%% It may be distributed and/or modified under the conditions
%% of the LaTeX Project Public License, either version 1.3c
%% of this license or (at your option) any later version.
%%
%% See https://www.latex-project.org/lppl.txt for details.
%%

\documentclass{tlc3exa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{207.0pt}
%StartShownPreambleCommands
\usepackage{multirow}
%StopShownPreambleCommands

\begin{document}
\begin{tabular}{|l|l|p{25mm}|l|}     \hline
\multirow{4}{14mm}{Text in column 1 (4 rows)}
 & C2a & C3a                & C4a \\
 & C2b & \multirow{2}{=}
          {Spanning 2 rows} & C4b \\
 & C2c &                    & C4c \\
 & C2d & C3d                & C4d \\ \hline
\end{tabular}
\end{document}