Two children run on the beach.
The children are at the beach
There is nothing in the second phrase that is not infer-able.
exists e1 x1 x2.(n_beach(x2) & on(e1,x2) & Actor(e1,x1) & v_run(e1) & n_child(x1) & card_eq_2(x1))
exists p1 x1 x2.(n_beach(x2) & n_child(x1) & at(x1,x2))