a woman and three children are in a room full of toys.
These people are in a room.
Sentence 2 gives you clarity in the actual position of the woman and three children. The area is not just full of toys, but an actual room is full of toys with these four people in total.
exists p1 x1 x2.(exists s1 x3 x4 x5.(in(x1,x3) & of(s1,x5) & n_toy(x5) & Theme(s1,x4) & a_full(s1) & (x3 = x4) & n_room(x3)) & n_child(x1) & card_eq_3(x1) & of(x1,x2) & n_woman(x2))
exists p1 x1.(n_people(x1) & exists x2.(in(x1,x2) & n_room(x2)))