Simplify the following text for a Grade 7 native English-speaking person.
Original: In December 2007 , it was announced that Activision would merge with Vivendi Games , which owns fellow games developer and publisher Blizzard , and the merger would close in July 2008 . The new company is called Activision Blizzard and is headed by Activision 's former CEO , Robert Kotick .
Simplified: It is going to merge with Vivendi and will be called Activision Blizzard .