Complex sentence: Parliament had been limited to a maximum of seven years under the Septennial Act 1716, but the Parliament Act 1911 amended the Septennial Act to limit Parliament to five years, beginning the first meeting of Parliament after the election.
Split into simpler sentences: Parliament had been limited to a maximum of seven years under the Septennial Act 1716, but this was reduced by the passing of the Parliament Act 1911. Parliament would now be limited to five years, beginning the first meeting of parliament after the election.