A man performing martial arts kicks his opponent.
A man performs martial arts.
performing martial arts can be rephrased as performs martial art.
exists e2 e1 s1 x1 x2 x3 x4.(Theme(e2,x4) & Actor(e2,x1) & v_kick(e2) & n_opponent(x4) & of(x4,x1) & n_male(x1) & Theme(e1,x3) & Actor(e1,x2) & v_perform(e1) & n_art(x3) & a_martial(s1) & Theme(s1,x3) & (x1 = x2) & n_man(x1))
exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_perform(e1) & n_art(x2) & a_martial(s1) & Theme(s1,x2) & n_man(x1))