Complex sentence: Kes is an Ocampa, a species that live for just 9 years but they have an ability to learn at great speeds, which allows her to learn medicine quickly and work with the Holographic Doctor.
Split into simpler sentences: Kes is an Ocampan, a species that live for just 9 years. They have an ability to learn at great speeds, which allows her to learn medicine quickly and work with the Holographic Doctor.