Complex sentence: Himura Kenji, a fictional character of the anime and manga series "Rurouni Kenshin"/ "Samurai X", is the son of Himura Kenshin and Kamiya Kaoru, as well as the student of his father's former sensei, Hiko Seijuro XIII.
Split into simpler sentences: Himura Kenji, a fictional character of the anime and manga series "Rurouni Kenshin"/ "Samurai X", is the son of Himura Kenshin and Kamiya Kaoru. Like Kenshin, Kenji was the student of his father's former sensei, Hiko Seijuro XIII.