Complex sentence: A prequel, "Paranormal Activity 2", was released on October 22,2010, and was followed by another in "Paranormal Activity 3" on October 21,2011.
Split into simpler sentences: A prequel, "Paranormal Activity 2", was released on October 22,2010. It was followed by another prequel in "Paranormal Activity 3", released on October 21,2011.