Complex sentence: SightWatcher comments seem confused but seem to be his first public admission to arbitrators that he was involved in the off-wiki attack pages and fake account for Mathsci and Muntuwandi on FurAffinity, registered on 26 November 2010, unused until 1 April 2011.
Split into simpler sentences: SightWatcher comments seem confused but seem to be his first public admission to arbitrators that he was involved in the off-wiki attack pages and fake account for Mathsci and Muntuwandi on FurAffinity. The fake account for me was registered on 26 November 2010, but unused until 1 April 2011.