The simplest way to do this is to start at the beginning of your career. If you are a more seasoned candidate, generally the past 10 years will suffice. Briefly talk about your roles, why you left, and what you learned.
"My career began in 2006 after graduating from the University of Florida with my Bachelor's Degree in Commerce. I worked for XYZ company as a junior broker. I stayed in that role for 4 years until I was offered a promotion with a competing firm. That is when I joined ABC Company..."