Little boys in white karate uniforms performing their martial arts indoors.
Children are performing martial arts.
Sentence two contains no non-inferrable information. Sentence one states that the boys are performing martial arts.
exists e1 s1 s2 s3 s4 x1 x2 x3 x4 x5.(a_topic(x1) & in(x1,x2) & Theme(e1,x4) & Actor(e1,x3) & v_perform(e1) & n_indoor(x4) & of(x4,x5) & n_art(x5) & a_martial(s4) & Theme(s4,x4) & of(x4,x1) & n_thing(x1) & (x2 = x3) & n_uniform(x2) & a_karate(s3) & Theme(s3,x2) & a_white(s2) & Theme(s2,x2) & n_boy(x1) & a_little(s1) & Theme(s1,x1))
exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_perform(e1) & n_art(x2) & a_martial(s1) & Theme(s1,x2) & n_child(x1))