Complex sentence: Tanaka began her career as a model in November 2007 when she appeared in the video "Hitomi Tanaka Bakunyuu J no Shogeki" as a gravure idol.
Split into simpler sentences: Tanaka began her career as a model in 2007. In November, she appeared in the video "Hitomi Tanaka Bakunyuu J no Shogeki" as a gravure idol.