Complex sentence: It was shortly co-opted by the DoE which renamed it, without any credit, and held 2 national and 1 international conferences on it and gave it to Princeton, as TNX or The Next Step.
Split into simpler sentences: It was shortly co-opted by the Department of Energy which renamed the system, and held 2 national and 1 international conferences on it. This line of development was then transferred to Princeton, as TNX or The Next Step.