Complex sentence: As Auckland was the Capital from 1840 until 1865 the provision of an Official Residence for the Governor was initially not a priority, it was only during the period of the fourth Governor, George Grey, that an official property was provided.
Split into simpler sentences: As Auckland was the Capital from 1840 until 1865, the provision of an Official Residence for the Governor was initially not a priority. It was only during the period of the fourth Governor, George Grey, that an official property was provided.