Complex sentence: Calling themselves the DevTeam, they began to make major modifications to "Hack" s code, they named their new version "NetHack", in part for the collaboration of the game over USENET.
Split into simpler sentences: Calling themselves the DevTeam, they began to make major modifications to "Hack" s code. They named their new version "NetHack", in part for the collaboration of the game over USENET.