Complex sentence: Arianne is an online multiplayer open source framework for developing Internet games, like Ultima Online or Everquest, created by Miguel Angel Blanch Lardin in 1999 with the assistance of developers around the world.
Split into simpler sentences: Arianne is an online multiplayer open source framework for developing Internet games similar to Ultima Online or Everquest. It was created by Miguel Angel Blanch Lardin in 1999 with the assistance of developers around the world.