A little dark-skinned boy in a yellow, number 21 jersey sees a pigeon.
A boy in a jersey sees a pigeon.
Little dark skinned boy is a boy and number 21 jersey is  a jersey.
exists e1 s1 s2 s3 x1 x2 x3 x4 x5.(Theme(e1,x5) & Actor(e1,x1) & v_see(e1) & n_pigeon(x5) & in(x1,x2) & n_jersey(x2) & n_date(x2) & a_date_day_21(x2) & a_date_day_21(x2) & of(x2,x4) & n_number(x4) & a_,(s3) & Theme(s3,x2) & of(x2,x3) & n_yellow(x3) & n_boy(x1) & a_dark-skinned(s2) & Theme(s2,x1) & a_little(s1) & Theme(s1,x1))
exists e1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_see(e1) & n_pigeon(x3) & in(x1,x2) & n_jersey(x2) & n_boy(x1))