Two young men perform martial arts in front of a basketball hoop.
The men are swimming.
One would not be performing martial arts and swimming at the same time.  It is not typical to perform martial arts in front of a basketball hoop.
exists e1 s1 s2 x1 x2 x3 x4 x5.(Theme(e1,x2) & Actor(e1,x1) & v_perform(e1) & in(x2,x3) & of(x3,x4) & n_hoop(x4) & of(x4,x5) & n_basketball(x5) & n_front(x3) & n_art(x2) & a_martial(s2) & Theme(s2,x2) & n_man(x1) & a_young(s1) & Theme(s1,x1) & card_eq_2(x1))
exists e1 x1.(n_man(x1) & Actor(e1,x1) & v_swim(e1))