A young teacher named Mr. Clark…
A young lawmaker named Senator Johnson…
¯\_(ツ)_/¯
Rephrasing it would have solved the problem.
“Darth Vader, a young Jedi who was a pupil of mine before he turned to evil, helped the Empire hunt down and destroy the Jedi Knights.”
Now it’s awkward in a more technically correct way. Yay English!