Complex sentence: She worked for Shelter from 1969 to 1971, and for the Social Services Department at the London Borough of Camden from 1971-74, when she became Deputy Director of the National Council for One-Parent Families.
Split into simpler sentences: She worked for Shelter from 1969 to 1971, and for the Social Services Department at the London Borough of Camden from 1971 to 1974. In 1974 she became Deputy Director of the National Council for One-Parent Families.