Complex sentence: The original of Jagex, "Java Gaming Experts," was changed to "Just About the Game Experience" prior to the release of "War of Legends", since Jagex no longer programmed their games exclusively in Java, the original tagline was rendered defunct.
Split into simpler sentences: The original of Jagex, "Java Gaming Experts," was changed to "Just About the Game Experience" prior to the release of "War of Legends'". Since Jagex no longer programmed their games exclusively in Java, the original tagline was rendered defunct.