But maybe you've simply had a lot of short-term jobs. If you've had a pile of jobs under one employer (e.g., as a travel nurse), you can list the entire period as one job. For example, "Month/Year to Month/Year, Travel Nurse, Travel Company X, USA."
To write up your experience, consider what period the travelling covers. If the travel jobs cover only a couple of years, give some information about the hospitals (e.g. "worked throughout the USA, in teaching hospitals ranging in size from 150-1,000 beds"), the types of positions you held (e.g., RN-ICU, RN-CSICU, RN-TICU, etc.), as well as some of the skills you used. If an employer wants more details, like the exact dates and exact roles you played and at which hospitals, they can ask you. However, if the travel jobs cover a good number of years, and so constitute your significant, recent experience, expand somewhat on the details provided.