Complex sentence: Usurper King Zant is the secondary antagonist in "Twilight Princess" who was originally a Twili (a race whose dabblings in dark magic got them sealed away in a shadow realm) whom Ganondorf tricked into serving him.
Split into simpler sentences: Usurper King Zant is the secondary antagonist in "Twilight Princess". He is a Twili (a race whose dabblings in dark magic got them sealed away in a shadow realm) whom Ganondorf tricked into serving him.