Complex sentence: Phase II, which connects to Terminals 2 and 3, is scheduled to be open in 2015, and the entire system--out to the Rental Car Center--should be complete by 2020.
Split into simpler sentences: Phase II, which connects to Terminals 2 and 3, is scheduled to be open in 2015. The final segment--out to the Rental Car Center--should be complete by 2020.