Several persons on the backs of camels traversing a hill.
People are on a caravan through the desert.
Just because people are on backs of camels traversing a hill that does not mean they are going through a desert.
exists e1 s1 x1 x2 x3 x4 x5.(n_back(x2) & a_topic(x1) & on(x1,x2) & of(x2,x3) & Theme(e1,x5) & Actor(e1,x4) & v_traverse(e1) & n_hill(x5) & (x3 = x4) & n_camel(x3) & n_person(x1) & a_several(s1) & Theme(s1,x1))
exists p1 x1 x2.(n_desert(x2) & through(p1,x2) & exists x3.(on(x1,x3) & n_caravan(x3)) & n_people(x1))