Girl with short hair playing guitar.
Girl playing a guitar.
There is a girl who has short hair that is playing a guitar. Sentence 2 follows sentence one minus the detail of the short hair.
exists e1 s1 s2 x1 x2.(ne_nam_girl(s1) & a_topic(s1) & with(s1,x1) & n_guitar(x1) & Actor(e1,x1) & v_play(e1) & of(x1,x2) & n_hair(x2) & a_short(s2) & Theme(s2,x1))
exists e1 x1 x2.(ne_nam_girl(x1) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_guitar(x2))