Custodian changes trashcans.
Man dancing on the roads.
The man described is unlikely to be dancing while he also changes trashcans.
exists s1 s2 x1 x2.(n_trashcan(x1) & a_.(s2) & Theme(s2,x1) & of(x1,x2) & n_change(x2) & a_custodian(s1) & Theme(s1,x1) & a_topic(x1))
exists x1 x2 x3.(n_road(x3) & a_topic(x1) & on(x1,x3) & n_dancing(x1) & of(x1,x2) & n_man(x2))