The children are sitting with their shoes off.
The kids are sleeping.
The group is either sitting or sleeping. They cannot do both simultaneously.
exists e1 s1 x1 x2.(n_shoe(x2) & of(x2,x1) & n_thing(x1) & n_child(x1) & a_off(s1) & Manner(e1,s1) & with(e1,x2) & Actor(e1,x1) & v_sit(e1))
exists e1 x1.(n_kid(x1) & Actor(e1,x1) & v_sleep(e1))