Complex sentence: The "Shellharbour (Municipal) Council" was constituted on 4 June 1859, and was gazetted as a City in 1996.Then in May 2009 Shellharbour City Council celebrated its 150th birthday.
Split into simpler sentences: The "Shellharbour (Municipal) Council" was constituted on 4 June 1859, and was gazetted as a City in 1996. In May 2009, Shellharbour City Council celebrated its 150th birthday.