Complex sentence: Horror genres such as slashers, home invasion, paranormal are examples of an unknown "other" coming into the protagonists lives, dealing them pain and pushing the protagonist to the point where they must stand up to the attack and become the hero.
Split into simpler sentences: Horror genres such as slashers, home invasion, and paranormal films are examples of an unknown "other" coming into the protagonists lives. This presence of the unknown "other" forces the characters to deal with pain, ultimately pushing the protagonist to the point where they must stand up to the attacker and become the hero.