Complex sentence: Barnabas insists on moving into the Old House and hosting a ball in honour of the family; however, on the night of the ball, Elizabeth's daughter Carolyn is bitten by Barnabas while she is getting ready.
Split into simpler sentences: Barnabas insists on moving into the Old House and hosting a ball in honour of the family. However, on the night of the ball, Elizabeth's daughter, Carolyn is bitten by Barnabas while she is getting ready.