Complex sentence: The album was originally scheduled to be released on 6/6/06, but the release date was postponed because, according to posts by the band on their forum, promotion had not begun far enough in advance and the parties involved decided to delay the release.
Split into simpler sentences: The album was originally scheduled to be released on 06/06/06, but the release date was postponed. According to posts by the band on their forum, promotion had not begun far enough in advance and the parties involved decided to delay the release.