Men, women and children dance at a party.
A bunch of people dance at a party.
Men ,woman and child explains more specifically who is dancing at the party than just a bunch of people.
exists x1 x2 x3 x4 x5 x6.(a_topic(x1) & rel(x1,x2) & subset_of(x4,x2) & at(x4,x6) & n_party(x6) & n_dance(x4) & of(x4,x5) & n_child(x5) & subset_of(x3,x2) & n_woman(x3) & n_man(x1))
exists x1 x2 x3 x4.(a_topic(x1) & at(x1,x4) & n_party(x4) & Time(x1,x3) & n_dance(x3) & of(x1,x2) & n_people(x2) & n_bunch(x1))