Complex sentence: The Europa League title holders also enter directly into the group stage if either they or the Champions League title holders gain direct entry to the group stage via their domestic league; otherwise, the Europa League title holders enter directly into the play-off round.
Split into simpler sentences: The Europa League title holder will also enter directly into the group stage if either they or the Champions League title holder gain direct entry via their domestic league. In other circumstances, the Europa League title holder will enter directly into the play-off round.