Complex sentence: Headquartered in New Zealand, it is 35% owned by state-owned enterprise New Zealand Post until December 2012 when that shareholding was sold to the New Zealand Superannuation Fund for $142m.
Split into simpler sentences: Headquartered in New Zealand, it is 35% owned by state-owned enterprise New Zealand Post. In December 2012 when that shareholding was sold to the New Zealand Superannuation Fund for $142m.