Complex sentence: The sudden deceleration sends guests crashing to the floor and causes several of the ship's fittings to break loose; one of the loosened objects is a speed boat which drops harmlessly into the ocean.
Split into simpler sentences: The sudden deceleration sends guests crashing to the floor and causes several of the ship's fittings to break loose. One of the loosened objects is a speed boat, which drops harmlessly into the ocean.