begin{table}
 newcolumntype{C}{>{centeringarraybackslash}X}
 centering
 captionsetup{justification=centering, hangindent=-0.2em}
 caption{some caption}
label{tab:somelabel}
begin{tabularx}{textwidth}{|*{9}{C|}}
    hline
             multirow{2}{*}{} & multicolumn{2}{|c|}{loooooooooong text} & multicolumn{2}{|c|}{looooooooooooooooooooooong text} & multicolumn{2}{|c|}{looooooooong text} & multicolumn{2}{|c|}{$H^V$} \
    cline{2-9}
    & vspace{1pt} (K) & vspace{1pt} (V) & vspace{1pt} (K) & vspace{1pt} (V) & vspace{1pt} (K) & vspace{1pt} (V) & vspace{1pt} (K) & vspace{1pt} (V)\
    hline
    multicolumn{9}{|c|}{textbf{some description}} \
    hline
    hspace{-9pt} I$1$~($90$)& $44.490.046$ & $37.214.853~(16~%)$ & $6.224$ & $5.992~(4~%)$ & $49$ & $15~(69~%)$ & $77$ & $76~(1~%)$\
    end{tabularx}
end{table}