documentclass[a4paper, 11pt]{article}
usepackage[margin=2cm]{geometry} % changes the margin
usepackage{enumitem}
usepackage{amssymb}
usepackage{titlesec}
usepackage{indentfirst}
usepackage{longtable}
usepackage{blindtext}


%% Create a very compact enumerated list environment
newlist{myenum}{enumerate}{1}
setlist[myenum]{label=arabic*., nosep, wide,
             leftmargin=*, % hanging indentation
             before=vspace{-0.57baselineskip},
             after =vspace{-0.8baselineskip}} % reducing vertical   space
%---------------------Need to Simplify This-----------------------------%
newlist{myenum2}{enumerate}{1}
setlist[myenum2]{label=alph*), nosep, wide,
             leftmargin=*, % hanging indentation
             before=vspace{-0.57baselineskip},
             after =vspace{-0.8baselineskip}} % reducing vertical space
newlist{myenum3}{enumerate}{1}
setlist[myenum3]{label=arabic*), nosep, wide,
             leftmargin=*, % hanging indentation
             before=vspace{-0.57baselineskip},
             after =vspace{-0.8baselineskip}} % reducing vertical space
newlist{myenum4}{enumerate}{1}
setlist[myenum4]{label=arabic*., nosep, wide,
             leftmargin=*, % hanging indentation
             before=vspace{-0.57baselineskip},
             after =vspace{-0.8baselineskip},
             start=2} % reducing vertical space
newlist{myenum5}{enumerate}{1}
setlist[myenum5]{label=arabic*., nosep, wide,
             leftmargin=*, % hanging indentation
             before=vspace{-0.57baselineskip},
             after =vspace{-0.8baselineskip},
             start=3} % reducing vertical space
newlist{myenum6}{enumerate}{1}
setlist[myenum6]{label=arabic*., nosep, wide,
             leftmargin=*, % hanging indentation
             before=vspace{-0.57baselineskip},
             after =vspace{-0.8baselineskip},
             start=4} % reducing vertical space
newlist{myenum7}{enumerate}{1}
setlist[myenum7]{label=arabic*., nosep, wide,
             leftmargin=*, % hanging indentation
             before=vspace{-0.57baselineskip},
             after =vspace{-0.8baselineskip},
             start=5} % reducing vertical space

renewcommandthesection{Alph{section}.}
renewcommandthesubsection{arabic{subsection}.}
%% Re-format the font size of "the section"
% {11} is the desired font size
% {15} is the vertical spacing, perhaps refers to 1.5 lines?
% selectfont is for un-bold the sub-section
titleformat{section}
{normalfontfontsize{11}{.5em}bfseries}{thesection}{.5em}
    {}
titleformat{subsection}
{normalfontfontsize{11}{.5em}selectfont}{thesubsection}{.5em}
    {}
titlespacing % starred version: first paragraph is not indented
{subsection} % <command>
{0em} % <left>
{.4em} % <before-sep>
{.3em} % <after-sep>

setlengthparindent{1cm}

% Avoid hypenation (breaking sentences in paragraph)
tolerance=1
emergencystretch=maxdimen
hyphenpenalty=10000
hbadness=10000

begin{document}
%------------------------------Section D---------------------------------------------%
section{Some Text Here}
begin{longtable}{@{}p{0.3textwidth}cp{0.65textwidth}}
%% Subsection 1
begin{myenum} item Some Text Here end{myenum} & : & blindtext \
%% Subsection 2
begin{myenum4} item Some Text Here end{myenum4} & : & blindtext \
%% Subsection 3
begin{myenum5} item Some Text Here end{myenum5} & : & begin{myenum3}
item Some Text Here;
item Some Text Here;
item Some Text Here;
item Some Text Here;
item Some Text Here;
item Some Text Here.
end{myenum3}\
%% Subsection 4
begin{myenum6} item Some Text Here end{myenum6} & : &   begin{myenum2}
item blindtext;
item blindtext;
end{myenum2}\
%% Subsection 5
begin{myenum7} item{Some Text Here} end{myenum7} & : & blindtext.\
end{longtable}
end{document}