People dancing and jumping with sailboats in the background.
People are on the beach.
People in sailboats doesn't imply people on the beach.
exists e2 e1 x1 x2 x3 x4 x5 x6.(n_background(x6) & n_background(x3) & in(e2,x6) & with(e2,x5) & n_sailboat(x5) & Actor(e2,x4) & v_jump(e2) & n_people(x4) & in(e1,x3) & with(e1,x2) & n_sailboat(x2) & Actor(e1,x1) & v_dance(e1) & n_people(x1))
exists p1 x1 x2.(n_beach(x2) & on(x1,x2) & n_people(x1))