A man of some native African tribe looking off into the distance.
They are on the horizon.
On the horizon is a rephrasing of into the distance.
exists e1 s1 s2 x1 x2 x3 x4.(n_distance(x4) & a_topic(x1) & of(x1,x2) & a_off(s2) & Manner(e1,s2) & into(e1,x4) & Actor(e1,x3) & v_look(e1) & (x2 = x3) & n_tribe(x2) & a_african(s1) & Theme(s1,x2) & r_native(x2) & n_man(x1))
exists p1 x1 x2.(n_horizon(x2) & n_thing(x1) & on(x1,x2))