An artist in a black sweater is sculpting large rocks.
An artist sculpting.
An artist sculpting large rocks is a more detailed version of an artist sculpting.
exists e1 s1 s2 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_sculpt(e1) & n_rock(x3) & a_large(s2) & Theme(s2,x3) & in(x1,x2) & n_sweater(x2) & a_black(s1) & Theme(s1,x2) & n_artist(x1))
exists x1 x2.(a_topic(x1) & n_sculpting(x1) & of(x1,x2) & n_artist(x2))