Complex sentence: Oak Bay Sea Rescue has a Junior Auxiliary Program for youths 13 through 17 years of age who train with the active crews until they become eligible for active duty on one of the eight five-member crews upon turning 18.
Split into simpler sentences: Oak Bay Sea Rescue has a Junior Auxiliary Program for youths 13 through 17 years of age. This program allows the youth members to train with the active crews until they become eligible for active duty on one of the eight five-member crews upon turning 18.