What should i tell to an employer when i'm going to be asked in an interview, 'how your past work experience will turn into a benefit for us?

Looking forward to bestow my 15 Years’ Rich Experience as a Librarian, with the prospect of managing Library, Planning to provide better services, maintaining library databases through online and oversee activities to make sure that everything functions correctly.

You can answer that 'the knowledge, skills and the experience which I gained from the previous jobs will be put into use in day-day work and also to solve problems', which infact is going to benefit the new employer.