An older man wearing a white shirt sits on a sidewalk.
A man waiting on the bus.
There is no way to infer that the older man is waiting for anything nor that he is waiting on the bus, which is an unclear sentence because it is not know if the preposition on is where the man is located or if it is that he is "waiting on" i.e., slang for "expecting the arrival of."
exists e2 e1 s1 s2 x1 x2 x3 x4.(on(e2,x4) & n_sidewalk(x4) & Actor(e2,x1) & v_sit(e2) & Theme(e1,x3) & Actor(e1,x2) & v_wear(e1) & n_shirt(x3) & a_white(s2) & Theme(s2,x3) & (x1 = x2) & n_man(x1) & r_more(s1) & a_older(s1) & Theme(s1,x1))
exists e1 x1 x2 x3.(n_bus(x3) & a_topic(x1) & on(e1,x3) & Actor(e1,x2) & v_wait(e1) & (x1 = x2) & n_man(x1))