Young people sit on the rocks beside their recreational vehicle.
The group of people is camping.
Peple together does not mean they fom a group, and a recreational vehicle near rocks does not mean they are camping.
exists e1 s1 s2 x1 x2 x3.(n_vehicle(x3) & a_recreational(s2) & Theme(s2,x3) & of(x3,x2) & n_thing(x2) & n_rock(x2) & beside(e1,x3) & on(e1,x2) & Actor(e1,x1) & v_sit(e1) & n_people(x1) & a_young(s1) & Theme(s1,x1))
exists e1 x1 x2.(n_group(x1) & Actor(e1,x1) & v_camp(e1) & of(x1,x2) & n_people(x2))