Complex sentence: He was taken on stage aged 1 by his dad in a production of operetta His Royal Highness and by the age of 12 started producing radio sketches at the Australian Broadcasting Corporation (then known as Commission).
Split into simpler sentences: He was taken on stage aged one by his father in a production of the operetta His Royal Highness. At age 12, he started producing radio sketches at the Australian Broadcasting Corporation (then known as the Australian Broadcasting Commission).