Guy's with skateboards waiting for something.
People have skateboards.
People is a rephrase of guy's.
exists e1 x1 x2 x3 x4 x5.(a_topic(x1) & with(x1,x3) & for(e1,x5) & n_thing(x5) & Actor(e1,x4) & v_wait(e1) & (x3 = x4) & n_skateboard(x3) & n_'s(x1) & (x1 = x2) & ne_nam_guy(x2))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_have(e1) & n_skateboard(x2) & n_people(x1))