Complex sentence: The game begins when Laura Harris is contacted by Los Angeles police, receiving a disturbing message: her father, Dr. Richter Harris has gone on a mass murdering spree and has now barricaded himself in the hospital.
Split into simpler sentences: The game begins when she is contacted by Los Angeles police, receiving a disturbing message. Her father, Dr. Richter Harris has gone on a mass murdering spree and has now barricaded himself in the hospital.