Complex sentence: Over the next few months, Denise and Jon became closer until in April 1995, he made a pass at her, she turned him down in no uncertain terms, and he walked out on her and the salon.
Split into simpler sentences: Over the next few months, Denise and Jon became closer. But, in April 1995, when he made a pass at her, he was put down in no uncertain terms, and he walked out on both her and the salon.