Complex sentence: The developers of Citadel/UX assert that it is the only active Citadel project, and thus entitled to bear the simple name "Citadel," however, this is controversial as some Citadel BBS software projects are still active.
Split into simpler sentences: The developers of Citadel/UX now refer to the project simply as "Citadel," based on the assertion that it is the only active Citadel project. Some have seen this is controversial, however, as some Citadel BBS software projects are still active.