A naked woman kneels on the rocks of a shallow stream.
A woman kneels in the stream.
The rocks of a stream are in the stream.  So a woman kneeling on the rocks is also kneeling in the stream.
exists s1 s2 x1 x2 x3 x4.(n_rock(x3) & a_topic(x1) & on(x1,x3) & of(x3,x4) & n_stream(x4) & a_shallow(s2) & Theme(s2,x4) & n_kneel(x1) & of(x1,x2) & n_woman(x2) & a_naked(s1) & Theme(s1,x1))
exists x1 x2 x3.(n_stream(x3) & a_topic(x1) & in(x1,x3) & n_kneel(x1) & of(x1,x2) & n_woman(x2))