Complex sentence: He served as an Alderman in the City of Edmonton on the municipal level and then went on to serve as a member of the Legislative Assembly of Alberta from 1921 to 1926 sitting with the Liberal caucus in opposition.
Split into simpler sentences: He served as an Alderman in the City of Edmonton on the municipal level. He went on to serve as a member of the Legislative Assembly of Alberta from 1921 to 1926 sitting with the Liberal caucus in opposition.