Complex sentence: Seventh-day Adventists hold a conditional immortality and annihilationism viewpoint; that the wicked will perish, and do not believe the wicked will suffer in Hell as a place of conscious eternal punishment, but instead teach conditional immortality.
Split into simpler sentences: Seventh-day Adventists hold a conditional immortality and annihilationism viewpoint: that the wicked will perish. They do not believe the wicked will suffer in hell as a place of conscious eternal punishment, but instead teach conditional immortality.