A sea of people holding umbrellas on a busy street.
Many people on the street are holding umbrellas.
Many People is a consequence of sentence 1 where it only clearly mentions a sea of people which implies many people.
exists e1 s1 x1 x2 x3 x4 x5.(a_topic(x1) & of(x1,x2) & Theme(e1,x4) & Actor(e1,x3) & v_hold(e1) & on(x4,x5) & n_street(x5) & a_busy(s1) & Theme(s1,x5) & n_umbrella(x4) & (x2 = x3) & n_people(x2) & n_sea(x1))
exists e1 x1 x2 x3.(n_street(x2) & Theme(e1,x3) & Actor(e1,x1) & v_hold(e1) & n_umbrella(x3) & on(x1,x2) & n_people(x1) & n_quantity(x1))