Man wearing a jacket while welding.
The jacket is a denim jean jacket.
Just because a man is wearing a jacket while welding, it doesn't imply the jacket is a denim jean jacket.
exists e1 e2 x1 x2 x3.(a_topic(x1) & while(e1,e2) & Actor(e2,x2) & v_weld(e2) & Theme(e1,x3) & Actor(e1,x2) & v_wear(e1) & n_jacket(x3) & (x1 = x2) & n_man(x1))
exists p1 x1.(n_jacket(x1) & exists x2 x3 x4.((x1 = x2) & n_jacket(x2) & of(x2,x4) & n_jean(x4) & of(x2,x3) & n_denim(x3)))