Complex sentence: Member of the Reykjavík City Council 1912--1920 and its chairman 1918--1920, and elected to the Althing for Reykjavík 1914-15 and 1919-20.
Split into simpler sentences: Member of the Reykjavík City Council 1912--1920 and was its chairman 1918--1920. He was elected to the Althing for Reykjavík 1914-15 and 1919-20.