Complex sentence: The figure holds a wisent horn, or possibly a cornucopia in one hand, which has 13 notches maybe symbolising the number of moons in a calendar year, also the number of menstrual cycles in one year.
Split into simpler sentences: The figure holds a wisent horn, or possibly a cornucopia, in one hand, which has 13 notches. According to some researchers, this may symbolise the number of moons or the number of menstrual cycles in one year.