Complex sentence: With this mindset, Takahashi stepped down from his lead role in the "Xenosaga" series, he continued to work for the company in a supervisory role by providing scenario draft's, while younger staff continued the series development.
Split into simpler sentences: With this mindset, Takahashi stepped down from his lead role in the "Xenosaga" series. He continued to work for the company in a supervisory role by providing the series' scenario drafts, while younger staff continued the series development.