Simplify the following text for a Grade 7 native English-speaking person.
Original: World of Warcraft , often referred to as WoW , is a massively multiplayer online role-playing game ( MMORPG ) by Blizzard Entertainment , a subsidiary of Activision Blizzard . It is the fourth released game set in the fantasy Warcraft universe , which was first introduced by Warcraft : Orcs & Humans in 1994 .
Simplified: World of Warcraft is a MMORPG created by Blizzard Entertainment .