Two boy children, one wearing a helmet, play at a table in a room full of toys.
The children are playing.
The children in Sentence 2 are just the children in Sentence 1 who are playing, without the extraneous details.
exists e1 s1 x1 x2 x3 x4 x5 x6 x7 x8 x9 x10.(a_topic(x1) & rel(x1,x3) & rel(x3,x6) & in(x6,x8) & of(s1,x10) & n_toy(x10) & Theme(s1,x9) & a_full(s1) & (x8 = x9) & n_room(x8) & at(x6,x7) & n_table(x7) & n_play(x6) & Theme(e1,x5) & Actor(e1,x4) & v_wear(e1) & n_helmet(x5) & (x3 = x4) & n_thing(x3) & card_eq_1(x3) & n_child(x1) & of(x1,x2) & n_boy(x2) & card_eq_2(x1))
exists e1 x1.(n_child(x1) & Actor(e1,x1) & v_play(e1))