Complex sentence: Mayo East was a parliamentary constituency represented in Dáil Éireann, the lower house of the Irish parliament or Oireachtas from 1969 to 1997, and elected 3 deputies (Teachtaí Dála, commonly known in English as TDs).
Split into simpler sentences: Mayo East was a parliamentary constituency in Ireland which was represented in Dáil Éireann, the lower house of the Irish parliament or Oireachtas. The constituency existed from 1969 to 1997, and elected three deputies (Teachtaí Dála, commonly known in English as TDs).