我想到的是用 minipage (之前看过有人说复杂点的排列一律用 minipage [B):
\documentclass{article}
\usepackage{graphicx}
\begin{document}
\begin{figure}[ht]
\centering
\begin{minipage}{0.65\linewidth}
\includegraphics[width=\linewidth]{example-image-a}
\caption{\label{fig:fig1}}
\end{minipage}
\begin{minipage}{0.28\linewidth}
\includegraphics[width=\linewidth]{example-image-b}
\caption{\label{fig:fig2}}
\includegraphics[width=\linewidth]{example-image-c}
\caption{\label{fig:fig3}}
\end{minipage}
\end{figure}
\end{document}