Many people riding a hanging roller coaster.
People are on a roller coaster.
Many people are people, and riding implies are on.
exists e1 x1 x2 x3 x4 x5.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_ride(e1) & n_coaster(x3) & of(x3,x5) & n_roller(x5) & of(x3,x4) & n_hanging(x4) & (x1 = x2) & n_people(x1) & n_quantity(x1))
exists p1 x1.(exists x2 x3.(on(x1,x2) & n_coaster(x2) & of(x2,x3) & n_roller(x3)) & n_people(x1))