Complex sentence: For example, a candidate is elected mayor of a town or wins a seat on a local authority at an election, then the same person wins a seat in the national or state/provincial legislature in a separate general election, this is a dual mandate.
Split into simpler sentences: For example, suppose a candidate wins a seat on a local authority at an election. If the same person then wins a seat in the national legislature in a separate general election, this is a dual mandate.