Within your career summary, you need to include details of all employment, set out as above. You should include achievements, duties and responsibilities for roles undertaken over the last 10 years in bullet point form. Anything older than this should be listed as earlier experience and just the dates to and from, job title and company name.
Alternatively, if your career change relates to something you have done in the dim and distant past, you can re-write the section as ‘Relevant Experience’ and then include another entitled ‘Other Experience’, to just bring the relevant skills to the forefront