A man is sitting on the ground welding something.
The man is welding something that had previously broken apart.
We cannot know from sentence one that the thing that he is welding previously broke apart.
exists e1 e2 x1 x2 x3 x4.(n_ground(x2) & on(e1,x2) & Theme(e2,x4) & Actor(e2,x3) & v_weld(e2) & n_thing(x4) & (x2 = x3) & Actor(e1,x1) & v_sit(e1) & n_man(x1))
exists e1 e2 p1 s1 x1 x2 x3.(n_man(x1) & Theme(e2,x2) & Actor(e2,x1) & v_weld(e2) & a_previously(s1) & Manner(e1,s1) & exists s2.(Theme(s2,x3) & a_apart(s2)) & Topic(e1,p1) & Actor(e1,x3) & v_break(e1) & (x2 = x3) & n_thing(x2))