documentclass{article}

usepackage{longtable}
usepackage {multirow}
usepackage{lipsum}

begin{document}

begin{center}

begin{longtable}{|p{.15textwidth}|p{.15textwidth}|p{0.65textwidth}|}
    hline
    1 & 1.1 & multirow{3}{.65textwidth} {lipsum[1] }\
     & 1.2 & \
     & 1.3 & \ hline
     2 & 2.1 & lipsum[2] \ hline
     end{longtable}
    end{center}

end{document}