Complex sentence: This disallowed peer-review of the system, which goes against the open source philosophy, and there are critics of the Xgl architecture who state that because of the lack of peer-review, the system has too many flaws to be useful.
Split into simpler sentences: This disallowed peer-review of the system, which is against the open source philosophy. Some critics of the Xgl architecture state that because of the lack of peer-review, the system has too many flaws to be useful.