Complex sentence: In 1970, he joined 2CA Canberra where he worked in a variety of on-air shifts for 18 months until mid- 1971 when he joined 3AW in Melbourne as their evening announcer working with the Reverend Alex Kenworthy for a number of years on "Nightline".
Split into simpler sentences: In 1970, he joined 2CA Canberra where he worked in a variety of on-air shifts for 18 months until mid- 1971, when he joined 3AW in Melbourne. As evening announcer, Blackman worked with the Reverend Alex Kenworthy for a number of years on "Nightline".