A young child with a helmet on playing with a Tonka truck.
A child has a helmet on while they play with a truck.
While playing with a truck, the child is wearing a helmet, but sentence two is simpler.
exists e1 s1 x1 x2 x3 x4 x5.(a_topic(x1) & with(x1,x2) & with(e1,x4) & n_truck(x4) & (x4 = x5) & ne_org_tonka(x5) & Actor(e1,x3) & v_play(e1) & (x2 = x3) & n_helmet(x2) & n_child(x1) & a_young(s1) & Theme(s1,x1))
exists e1 p1 s1 x1 x2.(exists e2 x3.(with(e2,x3) & n_truck(x3) & Actor(e2,x1) & v_play(e2)) & n_thing(x1) & while(e1,p1) & a_on(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_have(e1) & n_helmet(x2) & n_child(x1))