Complex sentence: Shocked by this disastrous turn of events, the Culture announced that they had been manipulating Chel all along, with the admission succeeding in stopping the war, but also in creating strong hatred towards the Culture.
Split into simpler sentences: Shocked by this disastrous turn of events, the Culture announced that they had been manipulating Chel all along. The admission succeeded in stopping the war, but also created strong hatred towards the Culture.