Theyhad be to able to digest that food rapidly, and then they hadundergo a whole series of other changes so they could metabolizethat food rapidly.
(they; hadundergo; a whole series of other changes; so they could metabolizethat food rapidly; T:then) (they; could metabolizethat rapidly; food)
they they
hadundergo could metabolizethat rapidly
a whole series of other changes so they could metabolizethat food rapidly T:then
food