documentclass[12pt, a4paper]{article}
    begin{document}
    I want them on the same row, side by side.
    vspace{0.5cm}
    begin{flushleft}
    line(1,0){150}\
    Supervisor\
    Name of the Supervisor\
    Title, Affiliation\
    Head of Department\
    Department of Electronics and Computer Engineering\
    end{flushleft}
    begin{flushright}
    line(1,0){150}\
    Internal Examiner\
    Name of Internal Examiner\
    Title, Affiliation\
    end{flushright}
    end{document}