[Tex/LaTex] How to split an equation over two lines

equationsmath-mode

I am new to LaTeX,

Here is my formula,

Output

\documentclass{article}
\begin{document}
    \begin{equation}
        \small{
        \Delta (h)_{T+S} =
        \prod_{j=1}^{N} \left[\frac {P(x^j,y^j|\theta_{paired})} 
        {P(x^j,y^j|\theta_{unpaired})}\right]\left[\frac{P(bp)_{x^j,y^j} 
        P(bp_{x^j,y^j}|pbp_{x^{j-1},y^{j+1}}) P(dl_{x^j})  
        P(dl_{x^j}|pdl_{x^{j-1}})P(dr_{y^j})P(dr_{y^j}|pdr_{y^{j+1}})}{P(sl) 
        P(dl|sl) P(sr) P(dr|sr)}\right]}
    \end{equation}
\end{document}

I want the equation to be split over two lines, how can I do this?
I tried, multline, align*, split, alignedat, nothing seems to work. Please help me with this. Thank you in advance.

Best Answer

Here there is my proposal to split your equation.

EDIT: The slight change in my code is due an additional \cdot.

enter image description here

\documentclass{article}
\usepackage[margin=2cm]{geometry}
\usepackage{mathtools,amssymb}
\begin{document}
\begin{equation}
\begin{split}
\Delta (h)_{T+S} & =\prod_{j=1}^{N} \left[\frac {P(x^j,y^j|\theta_{\mathrm{paired}})} 
{P(x^j,y^j|\theta_{\mathrm{unpaired}})}\right] \\
& \cdot \left[\frac{P(bp)_{x^j,y^j} 
P(bp_{x^j,y^j}|pbp_{x^{j-1},y^{j+1}}) P(dl_{x^j}) P(dl_{x^j}|pdl_{x^{j-1}})P(dr_{y^j})P(dr_{y^j}|pdr_{y^{j+1}})}{P(sl) 
P(dl|sl) P(sr) P(dr|sr)}\right]
\end{split}
\end{equation}
\end{document}
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