People sitting on benches in between trees.
People sit on park benches.
Just because there are benches between trees doesn't mean they are park benches. The presence of trees doesn't make it a park.
exists e1 s1 x1 x2 x3 x4.(a_topic(x1) & in(e1,x4) & n_tree(x4) & a_between(s1) & Theme(s1,x4) & on(e1,x3) & n_bench(x3) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_people(x1))
exists e1 x1 x2 x3.(on(e1,x2) & n_bench(x2) & of(x2,x3) & n_park(x3) & Actor(e1,x1) & v_sit(e1) & n_people(x1))