Complex sentence: The Unforgivable Curses featured in the Harry Potter novels are curses that, used on a fellow human, could land you a life sentence in Azkaban These curses include the Imperius Curse, Cruciatus Curse and Avada Kedovra.
Split into simpler sentences: The Unforgivable Curses featured in the Harry Potter novels are curses that use on a fellow human could land you a life sentance in Azkaban. They curse are the Imperius Curse, Cruciatus Curse and Avada Kedovra.