\documentclass[a4paper]{article}
\begin{document}
\begin{eqnarray*}
g^{\alpha\tau} \Biggl (
 \frac{\partial}{\partial x^{\alpha}}
 \left ( \frac{\partial g_{\nu\tau}}{\partial x^{\mu}} - \frac{\partial g_{\nu\mu}}{\partial x^{\tau}} \right )
 - \frac{\partial}{\partial x^{\nu}}
 \left ( \frac{\partial g_{\alpha\tau}}{\partial x^{\mu}} - \frac{\partial g_{\alpha\mu}}{\partial x^{\tau}} \right )
 + g^{\lambda\rho} \Biggl (
 \frac{1}{2} \frac{\partial g_{\alpha\lambda}}{\partial x^{\mu}} \frac{\partial g_{\tau\rho}}{\partial x^{\nu}}
 \qquad \quad \quad & & \\
 + \, \frac{\partial g_{\mu\lambda}}{\partial x^{\alpha}}
 \left ( \frac{\partial g_{\nu\rho}}{\partial x^{\tau}} - \frac{\partial g_{\nu\tau}}{\partial x^{\rho}} \right )
 + \left ( \frac{\partial g_{\lambda\mu}}{\partial x^{\nu}}
 + \frac{\partial g_{\nu\lambda}}{\partial x^{\mu}}
 - \frac{\partial g_{\mu\nu}}{\partial x^{\lambda}} \right )
 \left ( \frac{1}{2} \frac{\partial g_{\tau\alpha}}{\partial x^{\rho}} - \frac{\partial g_{\tau\rho}}{\partial x^{\alpha}} \right )
 \quad \quad & & \\
 - \, g_{\mu\nu} \Biggl (
 \frac{\partial}{\partial x^{\alpha}} \left ( \frac{\partial g_{\lambda\tau}}{\partial x^{\rho}}
 - \frac{\partial g_{\lambda\rho}}{\partial x^{\tau}} \right )
 + g^{\delta\beta} \Biggl (
 \frac{\partial g_{\lambda\alpha}}{\partial x^{\delta}} \left ( \frac{3}{4} \frac{\partial g_{\rho\tau}}{\partial x^{\beta}}
 - \frac{1}{2} \frac{\partial g_{\rho\beta}}{\partial x^{\tau}} \right )
 \quad & & \\
 \underbrace{\qquad \qquad \qquad \qquad \qquad \qquad \qquad \quad
 - \, \frac{\partial g_{\lambda\rho}}{\partial x^{\delta}} \left ( \frac{1}{4} \frac{\partial g_{\alpha\tau}}{\partial x^{\beta}}
 - \frac{\partial g_{\alpha\beta}}{\partial x^{\tau}} \right )
 - \frac{\partial g_{\lambda\beta}}{\partial x^{\delta}} \frac{\partial g_{\alpha\rho}}{\partial x^{\tau}}
 \Biggr ) \Biggr ) \Biggr ) \Biggr )}_{\mbox{Vorm van de ruimtetijd}}
 & = & \frac{16 \pi G}{c^{4}} \underbrace{T_{\mu\nu}}_{\mbox{Energie}} \\
\end{eqnarray*}
\end{document}
