Complex sentence: Leaving the BBC in the mid- 1960s, after a period in schools'broadcasting, she went freelance, and after Monica Sims was appointed to head the Children's Department in 1968, she resumed working for the BBC.
Split into simpler sentences: Leaving the BBC in the mid- 1960s, after a period in schools'broadcasting, she went freelance. When Monica Sims was appointed to head the Children's Department in 1968, Brooking resumed working for the BBC.