There are several trees around the horses.
The horses are near some trees.
several trees around the horses means horses are near some trees
exists p1 x1 x3.(n_horse(x3) & exists s1 x2.((x1 = x2) & around(x2,x3) & n_tree(x2) & a_several(s1) & Theme(s1,x2)))
exists p1 x1.(n_horse(x1) & exists x2.(near(x1,x2) & n_tree(x2)))