a swimmer swimming across a lap pool.
Someone is sleeping.
They cannot be sleeping and swimming at the same time.
exists x1 x2 x3 x4.(a_topic(x1) & across(x1,x3) & n_pool(x3) & of(x3,x4) & n_lap(x4) & n_swimming(x1) & of(x1,x2) & n_swimmer(x2))
exists e1 x1.(Actor(e1,x1) & v_sleep(e1) & n_person(x1))