Complex sentence: It was officially opened in November 1997 costing 3 million dollars to built, (including 1.5 million from private donors), and spanning 300 meters long, making it the longest pier in the Australasia.
Split into simpler sentences: It was officially opened in November 1997, and cost 3 million dollars to build (half of which was from private donor). Spanning 300 meters long, it is the longest pier in the Australasia.