Complex sentence: As a girl, Michelle studied ballet and had danced with the New York City Ballet, she was seventeen years old when she was photographed as a playmate of the month, at eighteen years of age, Donna Michelle remains the youngest Playmate of the Year.
Split into simpler sentences: As a girl, Michelle studied ballet and had danced with the New York City Ballet. At eighteen years of age, Donna Michelle remains the youngest Playmate of the Year.