A man in a lift bucket is trimming tree branches.
a man in a lift bucket
A man is in a lift bucket regardless of trimming or not.
exists e1 x1 x2 x3 x4 x5.(Theme(e1,x4) & Actor(e1,x1) & v_trim(e1) & n_branch(x4) & of(x4,x5) & n_tree(x5) & in(x1,x2) & n_bucket(x2) & of(x2,x3) & n_lift(x3) & n_man(x1))
exists x1 x2 x3.(a_topic(x1) & in(x1,x2) & n_bucket(x2) & of(x2,x3) & n_lift(x3) & n_man(x1))