A woman reading a book while riding a train.
A woman is reading.
The woman is reading as stated while on the train.
exists e2 e1 x1 x2 x3 x4.(a_topic(x1) & while(e1,e2) & Theme(e2,x4) & Actor(e2,x2) & v_ride(e2) & n_train(x4) & Theme(e1,x3) & Actor(e1,x2) & v_read(e1) & n_book(x3) & (x1 = x2) & n_woman(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_read(e1) & n_thing(x2) & n_woman(x1))