Complex sentence: Suddenly, Miyuki and Vanessa appears on either side of Allison as ghosts and Ms. Dale becomes a ghost herself and makes a loud moaning noise and suddenly realize that Ms. Dale has also been killed by Kayako, Allison flees the office.
Split into simpler sentences: Suddenly, Miyuki and Vanessa appear on either side of Allison as ghosts and Ms. Dale becomes a ghost herself and makes a loud moaning noise. Realizing that Ms. Dale has also been killed by Kayako, Allison flees the office.