Complex sentence: The Byakkotai were the topic of a 2007 TV drama, which starred Yamashita Tomohisa, who portrayed another Byakkotai survivor, Sakai Mineji.
Split into simpler sentences: The Byakkotai were the topic of a 2007 TV drama, which starred Yamashita Tomohisa. Yamashita portrayed another Byakkotai survivor, Sakai Mineji.