Complex sentence: Gayle and Blanks also have a son, Billy Blanks, Jr., who works as a dancer, singer and fitness instructor, having produced several best-selling DVDs, including "Cardioke" and "Fat Burning Hip Hop Mix".
Split into simpler sentences: Gayle and Blanks also have a son, Billy Blanks, Jr., who works as a dancer, singer and fitness instructor. Blanks Jr. produced several best-selling DVDs, including "Cardioke" and "Fat Burning Hip Hop Mix".