Complex sentence: From 1866 to 1878 he represented West Melbourne and was Speaker of the Assembly between April 1871 and April 1877 and again from 11 May to 29 June 1880.
Split into simpler sentences: From 1866 to 1878 he represented West Melbourne and was Speaker of the Assembly between April 1871 and April 1877. MacMahon was Speaker again from 11 May to 29 June 1880.