Complex sentence: Thomas MacDonagh Tower was one of the oldest and best known tower blocks in Ballymun it was the second tower to go up in 1966, in 2005 it was demolished by controlled implosion.
Split into simpler sentences: Thomas MacDonagh Tower was one of the oldest and best known tower blocks in Ballymun. It was the second tower to go up in 1966 and in 2005 was demolished by controlled implosion.