A bunch of cowboys are awaiting their challenge of catching a live animal.
The cowboys are on a ranch.
"Live animal" is so vague that the men could be in a meadow or inside a house, not just a ranch.
exists e1 e2 s1 x1 x2 x3 x4 x5.(Theme(e2,x3) & Actor(e2,x1) & v_await(e2) & Theme(e1,x5) & Actor(e1,x4) & v_catch(e1) & n_animal(x5) & a_live(s1) & Theme(s1,x5) & (x3 = x4) & n_challenge(x3) & of(x3,x1) & n_thing(x1) & of(x1,x2) & n_cowboy(x2) & n_bunch(x1))
exists p1 x1.(n_cowboy(x1) & exists x2.(on(x1,x2) & n_ranch(x2)))