Six women in what appears to be a roller derby match, with bleachers and onlookers in the background.
Some women are doing roller derby with an audience.
The first sentence is more specific, six instead of some when describing the women at the roller derby. Audience is the same as onlookers.
exists e1 p1 x1 x2 x6.(n_background(x6) & Topic(e1,p1) & Actor(e1,x1) & v_appear(e1) & exists p2 x3 x4 x5.(with(p2,x3) & subset_of(x5,x3) & in(x5,x6) & n_onlooker(x5) & subset_of(x4,x3) & n_bleacher(x4) & exists x7 x8 x9.((x1 = x7) & n_match(x7) & of(x7,x9) & n_derby(x9) & of(x7,x8) & n_roller(x8))) & in(x1,x2) & n_what(x2) & n_woman(x1) & card_eq_6(x1))
exists e1 x1 x2 x3 x4.(with(e1,x4) & n_audience(x4) & Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & n_derby(x2) & of(x2,x3) & n_roller(x3) & n_woman(x1))