A dark-skinned woman swims in clear water.
A woman is swimming in the lake.
A woman does not have to be dark-skinned.  Just because a woman swims in clear water it does not mean they are swimming in a lake.
exists s1 s2 x1 x2 x3.(a_topic(x1) & in(x1,x3) & n_water(x3) & a_clear(s2) & Theme(s2,x3) & n_swim(x1) & of(x1,x2) & n_woman(x2) & a_dark-skinned(s1) & Theme(s1,x1))
exists e1 x1 x2.(n_lake(x2) & in(e1,x2) & Actor(e1,x1) & v_swim(e1) & n_woman(x1))