Complex sentence: She worked for the Bank of New South Wales (since 1982 the Westpac Banking Corporation) from 1958--64 and became a secretary in 1976 of a Special School in Essex, which helps physically handicapped children with riding lessons.
Split into simpler sentences: She worked for the Bank of New South Wales (since 1982 the Westpac Banking Corporation) from 1958--64. She became a secretary of a Special School in Essex in 1976, helping physically handicapped children with riding lessons.