Complex sentence: Since 2004, he has only been working as illustrator to works written by other authors, most notably on the series "To Love-Ru-Trouble -" alongside his former assistant Saki Hasemi.
Split into simpler sentences: Since 2004, he has only been working as illustrator to works written by other authors. Most notably on the series "To Love-Ru-Trouble -" alongside his former assistant Saki Hasemi.