Complex sentence: No claimant has progressed his claim before the House of Lords Committee for Privileges to a satisfactory conclusion, until the Dissolution of Parliament on 12 April 2010, the only body which is authorised to decide whether or not a claimant may be confirmed in the title.
Split into simpler sentences: No claimant has progressed his claim before the House of Lords Committee for Privileges to a satisfactory conclusion. This Commitee was-until the Dissolution of Parliament on 12 April 2010-the only body which is authorised to decide whether or not a claimant may be confirmed in the title.