Complex sentence: While the experiment was a success, Zephyr became deranged and killed everyone at the facility before being subdued by Vashyron: despite expecting to die, Zenith intervened and made him effectively immortal.
Split into simpler sentences: While the experiment was a success, Zephyr became deranged and killed everyone at the facility before being subdued by Vashyron. Despite expecting to die, Zenith intervened and made him effectively immortal.