Complex sentence: Up until the end of November 2007, Inkscape's bug tracking system was hosted on Sourceforge, however it was announced on 21 November 2007, that they would move to Launchpad.
Split into simpler sentences: Up until the end of November 2007, Inkscape's bug tracking system was hosted on Sourceforge. It was announced on 21 November 2007, that they would move to Launchpad.