Two men in black shirts each standing on one arm.
Two men are balancing on one arm.
The men are standing on one arm because they're balancing.
exists x1.(all x2.(n_standing(x2) -> exists s1 x3 x4.(a_topic(x1) & on(x1,x4) & n_arm(x4) & card_eq_1(x4) & in(x1,x3) & for(x3,x2) & n_shirt(x3) & a_black(s1) & Theme(s1,x3))) & n_man(x1) & card_eq_2(x1))
exists e1 x1 x2.(on(e1,x2) & n_arm(x2) & card_eq_1(x2) & Actor(e1,x1) & v_balance(e1) & n_man(x1) & card_eq_2(x1))