A brown dog walks in the grass with its tongue hanging out.
A brown dog walks in grass.
A brown dog walks in grass in both sentences, but the first sentence adds some additional description.
exists e1 e2 s1 s2 x1 x2 x3 x4.(n_tongue(x3) & of(x3,x2) & n_thing(x2) & n_grass(x2) & with(e1,x3) & a_out(s2) & Manner(e2,s2) & Actor(e2,x4) & v_hang(e2) & (x3 = x4) & in(e1,x2) & Actor(e1,x1) & v_walk(e1) & n_dog(x1) & a_brown(s1) & Theme(s1,x1))
exists e1 s1 x1 x2.(in(e1,x2) & n_grass(x2) & Actor(e1,x1) & v_walk(e1) & n_dog(x1) & a_brown(s1) & Theme(s1,x1))