Complex sentence: The club were expelled from the Conference National on 11 June 2011; their unstable financial position meant they could not guarantee to complete all their fixtures in the 2011--12 season, and resulted in their dissolution.
Split into simpler sentences: The club were expelled from the Conference National on 11 June 2011. This decision was made due to their unstable financial position, meaning they could not guarantee being able to complete all their fixtures in the 2011--12 season, resulting in their dissolution.