Some kids with a horse having fun.
The children are all girls.
Sentence two may be talking about different children.
exists e1 x1 x2 x3 x4.(a_topic(x1) & with(x1,x2) & Theme(e1,x4) & Actor(e1,x3) & v_have(e1) & n_fun(x4) & (x2 = x3) & n_horse(x2) & n_kid(x1))
exists p1 x1.(n_child(x1) & all x2.(n_girl(x2) -> (x1 = x2)))