Complex sentence: This does not diminish the power of the Monarch, or her representative in Canada, the governor general, to call an election at any time prior to October 19,2015; calling an election early is conventionally done on the advice of the Prime Minister.
Split into simpler sentences: This does not diminish the power of the Monarch, or her representative in Canada, the governor general, to call an election at any time. Calling an election early is conventionally done on the advice of the Prime Minister.