Complex sentence: Delta tries to take her mind off the situation and goes to the Shangri-La dance, instantly capturing the heart of Billy, the camp's mechanic upsetting of Ray, who loves Billy herself.
Split into simpler sentences: Delta tries to take her mind off the situation and goes to the Shangri-La dance. She captures the heart of Billy, the camp's mechanic, to the chagrin of Ray, who loves Billy herself.