\documentclass{article}
\usepackage{subcaption}
\usepackage[demo]{graphicx}
\begin{document}
\begin{figure*}[tp!]
\begin{minipage}[t]{.63\linewidth}
\begin{subfigure}[t]{0.49\textwidth}
\centering
\includegraphics[width=\textwidth]{figures/1a.pdf}
\caption{Subfigure}\label{fig:1a}
\end{subfigure}
\begin{subfigure}[t]{0.49\textwidth}
\centering
\includegraphics[width=\textwidth]{figures/1b.pdf}
\caption{Subfigure}\label{fig:1b}
\end{subfigure}
\caption{}
\end{minipage}\hfill
\begin{minipage}[t]{.315\linewidth}
\centering
\includegraphics[width=\textwidth]{figures/1b.pdf}
\caption{}\label{fig:2}
\end{minipage}
\end{figure*}
\end{document}