Complex sentence: The recent destruction of three of these gates, and Xykon's apparent interest in the remaining two, has led to a fear that the Snarl would be released and serves as the plot hook for the protagonists' campaign.
Split into simpler sentences: The recent destruction of three of these gates and Xykon's apparent interest in the remaining two has led to a fear that the Snarl would be released. This serves as the plot hook for the protagonists' campaign.