Complex sentence: From 1900 to 1930 further reclamations were made for railways and Harbour Board purposes and additional wharves, the seawall at Oriental Bay was built and the boat harbour at Clyde Quay was constructed.
Split into simpler sentences: From 1900 to 1930 further reclamations were made for railways and Harbour Board purposes. Additional wharves and the seawall at Oriental Bay were built, and the boat harbour at Clyde Quay was constructed.