Two young boys enjoy playing in shallow water while looking back at the photographer.
Two young boys playing in water.
I believe these might be switched, as the second sentence contains no information that isn't in the first sentence. Two young boys playing in water seems appears in the beginning of the first sentence in entirety.
exists e1 p1 s1 x1 x3.(n_photographer(x3) & exists e3 e2 s2 s3 x2.(while(e2,e3) & a_back(s3) & Manner(e3,s3) & at(e3,x3) & Actor(e3,x1) & v_look(e3) & in(e2,x2) & n_water(x2) & a_shallow(s2) & Theme(s2,x2) & Actor(e2,x1) & v_play(e2)) & Topic(e1,p1) & Actor(e1,x1) & v_enjoy(e1) & n_boy(x1) & a_young(s1) & Theme(s1,x1) & card_eq_2(x1))
exists e1 s1 x1 x2 x3.(a_topic(x1) & in(e1,x3) & n_water(x3) & Actor(e1,x2) & v_play(e1) & (x1 = x2) & n_boy(x1) & a_young(s1) & Theme(s1,x1) & card_eq_2(x1))