Complex sentence: In addition to adding new zones to the game, the expansion also introduced a network of portal points through the game realm, via which players could quickly and easily travel to and from various regions through the central plane, called the Plane of Knowledge.
Split into simpler sentences: In addition to adding new zones to the game, the expansion also introduced a network of portal points through the game realm. Players could use them to quickly and easily travel to and from various regions through a central plane, known as Plane of Knowledge.