Complex sentence: Traffic from BL-80 can access eastbound I-80 or turn off to Frontage Road; however, to access westbound I-80, travelers must continue eastbound until the next exit, and turn around.
Split into simpler sentences: Traffic from BL-80 can access eastbound I-80 or turn off to Frontage Road. However, to access westbound I-80, travelers must continue eastbound until the next exit, and turn around.