Complex sentence: Kevin feels a little disappointed when it appears that Wendy got over her crush for him and has moved on, or has she and to make matters worse, Kevin decides to get everything out in the open during her wedding ceremony.
Split into simpler sentences: Kevin feels a little disappointed when it appears that Wendy got over her crush for him and has moved on, or has she? And to make matters worse, Kevin decides to get everything out in the open during her wedding ceremony.