Complex sentence: The warehouses and wharf facilities near the Opera House were progressively removed in the mid- 20th century and replaced by modernist office blocks, but in 1998 a complex of contemporary buildings were built here, including the Bennelong Apartments, nicknamed "the Toaster".
Split into simpler sentences: The warehouses and wharf facilities near the Opera House were progressively removed in the mid- 20th century and replaced by modernist office blocks. In 1998, a complex of contemporary buildings replaced the modernist office blocks, including the Bennelong Apartments, nicknamed "the Toaster".