Trees obscure a building to the right.
The trees were actually pine trees.
Sentence 1 doesn't specify what kind of tree, in this case, pine.
exists e1 x1 x2 x3.(n_right(x3) & ne_nam_trees(x1) & to(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_obscure(e1) & n_building(x2))
exists s1 s2 x1 x2.(n_tree(x1) & Time(s1,x2) & n_tree(x2) & a_actually(s2) & Manner(s1,s2) & Theme(s1,x1) & a_pine(s1))