Picture of a hotdog vendor in the street.
a man inside a stadium
The first sentence described a picture that was being seen where there is no mention of that in the second sentence. There is no proof that the hotdog vendor is a man and the hotdog vendor is in the street not in the stadium.
exists x1 x2 x3 x4.(n_street(x4) & a_topic(x1) & of(x1,x2) & in(x2,x4) & n_vendor(x2) & of(x2,x3) & n_hotdog(x3) & n_picture(x1))
exists x1 x2.(a_topic(x1) & inside(x1,x2) & n_stadium(x2) & n_man(x1))