Young men in white jerseys, playing a form of roller hockey.
The men are playing
For men in jerseys to play roller hockey, men must be playing.
exists e1 s1 s2 x1 x2 x3 x4 x5 x6.(a_topic(x1) & Theme(e1,x4) & Actor(e1,x3) & v_play(e1) & of(x4,x5) & n_hockey(x5) & of(x5,x6) & n_roller(x6) & n_form(x4) & (x1 = x3) & in(x1,x2) & n_jersey(x2) & a_white(s2) & Theme(s2,x2) & n_man(x1) & a_young(s1) & Theme(s1,x1))
exists e1 x1.(n_man(x1) & Actor(e1,x1) & v_play(e1))