A female singer on stage playing the guitar and singing.
A female singer playing on stage.
sentence two does not say she is singing or has a guitar.
exists e1 s1 x1 x2 x3 x4 x5 x6.(n_singing(x6) & n_guitar(x5) & subset_of(x6,x4) & subset_of(x5,x4) & a_topic(x1) & on(x1,x2) & Theme(e1,x4) & Actor(e1,x3) & v_play(e1) & (x2 = x3) & n_stage(x2) & n_singer(x1) & a_female(s1) & Theme(s1,x1))
exists e1 s1 x1 x2 x3.(a_topic(x1) & on(e1,x3) & n_stage(x3) & Actor(e1,x2) & v_play(e1) & (x1 = x2) & n_singer(x1) & a_female(s1) & Theme(s1,x1))