Complex sentence: Jealous, as she had been hoping to dance with Nicholas herself, Delancy trips Blair in order to once again humiliate her; however, Nicholas helps Blair quickly recover, as the two lead the overall group (sans Delancy).
Split into simpler sentences: Jealous, as she had been hoping to dance with Nicholas herself, Delancy trips Blair in order to once again humiliate her. Thankfully, Nicholas helps Blair to quickly recover, as the two lead the overall group (sans Delancy).