Complex sentence: Forster was a member of the BBC Advisory Committee on the Social Effects of Television (1975--77), the Arts Council Literary Panel (1978--81), and chief reviewer for non-fiction in the "Evening Standard" (1977--80).
Split into simpler sentences: Forster was a member of the BBC Advisory Committee on the Social Effects of Television (1975--77) and the Arts Council Literary Panel (1978--81). She was the main non-fiction reviewer for the "Evening Standard" (1977--80).