Two men in red shirts race on bicycles, while others watch.
cat sits in tub
The second sentence has nothing to do with the first. The first is discussing what men are doing while the second mentions a cat.
exists p1 p2 p3 s1 x1 x2 x3 x4.(rel(p1,x1) & on(x1,x4) & n_bicycle(x4) & in(x1,x2) & n_race(x2) & of(x2,x3) & n_shirt(x3) & a_red(s1) & Theme(s1,x2) & n_man(x1) & card_eq_2(x1) & exists x6.n_event(x6) & exists e1 x5.(Actor(e1,x5) & v_watch(e1) & -(x5 = x1) & n_person(x5)) & n_person(x1) & while(p2,p3))
exists e1 x1 x2.(in(e1,x2) & n_tub(x2) & Actor(e1,x1) & v_sit(e1) & n_cat(x1))