Complex sentence: Yancy's first marriage was to Natalie Cole on July 31,1976, which they had a son together, Robert Adam "Robbie" Yancy, who was born on October 15,1977, but this marriage ended in divorce in 1980.
Split into simpler sentences: Yancy's first marriage was to Natalie Cole on July 31,1976,. They had a son together, Robert Adam "Robbie" Yancy, who was born on October 15,1977, but this marriage ended in divorce in 1980.