Several Asian people are on a train.
The people on the train are on vacation.
Asian people are on a train are not necessarily on vacation.
exists p1 s1 s2 x1.(exists x2.(on(x1,x2) & n_train(x2)) & n_people(x1) & a_asian(s2) & Theme(s2,x1) & a_several(s1) & Theme(s1,x1))
exists p1 x1 x2.(n_train(x2) & n_people(x1) & exists x3.(on(x1,x3) & n_vacation(x3)) & on(x1,x2))