Complex sentence: Lemass followed his father into politics in 1955 when he was elected to Dublin City Council, and was elected to Dáil Éireann in a by-election in Dublin South West the following year.
Split into simpler sentences: Lemass followed his father into politics in 1955 when he was elected to Dublin City Council. He was elected to Dáil Éireann in a by-election in Dublin South West the following year.