Complex sentence: This became the Adelaide studios of 5AN and 5CL for the Australian Broadcasting Commission (instituted by the Commonwealth government, later became Australian Broadcasting Corporation); the church and its outbuildings became the orchestral studio and PMG technical workshops.
Split into simpler sentences: This became the Adelaide studios of 5AN and 5CL for the Australian Broadcasting Commission (which later became the Australian Broadcasting Corporation). The church and its outbuildings became the orchestral studio and PMG technical workshops.