Complex sentence: The headquarters were moved to Tower 1,201 Sussex Street and two new nine-storey buildings which were built at the site of the former Sega World Sydney, in Darling Harbour on the western side of Sydney's city centre.
Split into simpler sentences: The headquarters were moved to Tower 1,201 Sussex Street. Additionally, two new nine-storey buildings which were built at the site of the former Sega World Sydney, in Darling Harbour on the western side of Sydney's city centre.