Complex sentence: In 2000 GreatSights opened a visitor information centre at 180 Quay Street, Auckland, now Discover New Zealand, the departure point for all GreatSights day tours from Auckland.
Split into simpler sentences: In 2000 GreatSights opened a visitor information centre at 180 Quay Street, Auckland. This became the departure point for all GreatSights day tours from Auckland.