Children are wearing life-jackets on an inflatable boat with paddles.
Kids are wearing safety vests on a boat.
Kids are children.  Safety vests are life-jackets.  An inflatable boat with paddles is a boat.
exists e1 s1 x1 x2 x3 x4.(on(e1,x3) & with(x3,x4) & n_paddle(x4) & n_boat(x3) & a_inflatable(s1) & Theme(s1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_wear(e1) & n_life-jacket(x2) & n_child(x1))
exists e1 x1 x2 x3 x4.(Theme(e1,x2) & Actor(e1,x1) & v_wear(e1) & on(x2,x4) & n_boat(x4) & n_vest(x2) & of(x2,x3) & n_safety(x3) & n_kid(x1))