Complex sentence: Having been a fan favorite, she was heavily supported by fans, and produced her first music video for her single, "Dollhouse", her most successful single to date, having been certified platinum by the Recording Industry Association of America (RIAA).
Split into simpler sentences: Having been a fan favorite, she was heavily supported by fans, and produced her first music video for her single, "Dollhouse". Dollhouse is her most successful single to date, having been certified platinum by the Recording Industry Association of America (RIAA).