Complex sentence: Its last up-to-date version contains up to Sequence 6, which was released on 17th March, 2006, and since SmokingWOLF is currently working on other projects, a schedule of the next version's issue is not certain.
Split into simpler sentences: Its last up-to-date version contains up to Sequence 6, which was released on March 17,2006. Since SmokingWOLF is currently working on other projects, a schedule for the next version's issue is not certain.