Hispanic people sitting on the beach in the sand talking on the phone.
People are at a beach.
people sitting on the beach  is  a rephrasing of '' people are at a beach.''
exists e2 e1 s1 x1 x2 x3 x4 x5.(n_phone(x5) & n_sand(x4) & n_beach(x3) & a_topic(x1) & for(e1,e2) & on(e2,x5) & Actor(e2,x2) & v_talk(e2) & in(e1,x4) & on(e1,x3) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_people(x1) & a_hispanic(s1) & Theme(s1,x1))
exists p1 x1.(exists x2.(at(x1,x2) & n_beach(x2)) & n_people(x1))