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begin{equation}

    Ep= (Required Personality Level of Each Resource-Assigned Personality 

    Level of each Resources)times (datextsubscript{i})

end{equation}

this is the equation.

Mathematical symbols where created to represent the meaning of longer descriptive words in a short form for easy inclusion in complex formulas with possible repetition. I would choose a suitable symbol/character to represent that long sentence like this (choose your own descriptive symbol):

documentclass{article}

begin{document}



begin{equation}

  Ep = P_l times da_i,

end{equation}

%

where $P_l =$ Required Personality Level of Each Resource-Assigned Personality Level of all Resources



end{document}

break your long text into two lines:

documentclass{article}



begin{document}

begin{equation}

    Ep = left(begin{tabular}{l}

                Required Personality Level of Each Resource-\

                Assigned Personality Level of each Resources

                end{tabular}right)

        times (da_{i})

end{equation}

end{document}