Complex sentence: He is a popular figure in the Otaku subculture, in part because of songs used in anime, such as Welcome to the N.H.K., Hellsing, and Sayonara Zetsubō Sensei.
Split into simpler sentences: He is a popular figure in the Otaku subculture. He sometimes makes anime songs, such as Welcome to the N.H.K., Hellsing, and Sayonara Zetsubō Sensei.