Two children, an older boy and a younger girl, are walking down a sidewalk wearing their winter coats.
Two children are walking.
Sentence 2 simply restates what Sentence 1 has already said, that two children are walking.
exists e2 e1 s1 s2 s3 x1 x2 x3 x4 x5 x6 x7 x8.(for(e1,e2) & Theme(e2,x7) & Actor(e2,x1) & v_wear(e2) & n_coat(x7) & of(x7,x8) & n_winter(x8) & of(x7,x2) & n_thing(x2) & a_down(s3) & Manner(e1,s3) & Theme(e1,x6) & Actor(e1,x1) & v_walk(e1) & n_sidewalk(x6) & subset_of(x3,x1) & subset_of(x5,x3) & n_girl(x5) & r_more(s2) & a_younger(s2) & Theme(s2,x5) & subset_of(x4,x3) & n_boy(x4) & r_more(s1) & a_older(s1) & Theme(s1,x4) & subset_of(x2,x1) & n_child(x2) & card_eq_2(x2))
exists e1 x1.(Actor(e1,x1) & v_walk(e1) & n_child(x1) & card_eq_2(x1))