Show how and whom you trained. RezReaders appreciate the knowledge base suggested by the ability to teach. A smaller company in particular may be run by an entrepreneur whose nightmare is being forced to take time away from running the company to hire and train new people. Study the resumes of people in your field. Seeing how others have handled similar issues is a championship tee-up for writing your own treatment.
Libraries have books of resumes for specific career fields.
Or look at the thousands of resumes on the Internet. If your career history looks like the fall of the Roman Empire, don't try to explain a lifetime of disasters on a resume. Save your explanations for an interview. Use your friends and acquaintances to help you obtain interviews. Make the resume as brief and as adversity-free as you legitimately can.