Complex sentence: The sensational plot and the notoriety of the Nuns' ballet ensured that the opera was a hot topic in journals and reviews-this was assisted by the marketing skills of the director Véron and the publisher Schlesinger.
Split into simpler sentences: The sensational plot and the notoriety of the Nuns' ballet ensured that the opera was a hot topic in journals and reviews. This was assisted by the marketing skills of the director Véron and the publisher Schlesinger.