Complex sentence: Before October 2005, when certain provisions of the Constitutional Reform Act 2005 took effect, the holder of this office was known as the Vice-Chancellor and effectively acted as the Lord Chancellor's deputy in the British legal system.
Split into simpler sentences: Before October 2005, when certain provisions of the Constitutional Reform Act 2005 took effect, the office was known as the Vice-Chancellor. He effectively acted as the Lord Chancellor's deputy in the British legal system.