Complex sentence: There were controversies most notably his approval during his first week as minister of the appointment of Mary Allen to the Royal Opera House in which case a Select Committee report found that he had exceeded his authority and failed in not seeking advice from his Permanent Secretary.
Split into simpler sentences: There were controversies, such as his approval during his first week as minister of the appointment of Mary Allen to the Royal Opera House. In this case, a Select Committee report later found that he had exceeded his authority and had improperly failed to seek advice from his Permanent Secretary.