Complex sentence: At the dance, Lalita and Johnny show much chemistry to the dismay of Will who is slowly falling in love with her, yet she continues to reject his advances and warning to not "believe everything she hears".
Split into simpler sentences: At the dance, Lalita and Johnny show much chemistry to the dismay of Will, who is slowly falling in love with her. She rejects his advances and his warning to not "believe everything she hears".