Complex sentence: GO Wellington is the brand name of the NZ Bus Wellington, New Zealand subsidiary Wellington City Transport Ltd, branded "Stagecoach Wellington" by its previous owner, the Stagecoach Group.
Split into simpler sentences: GO Wellington is the brand name of Wellington City Transport Ltd, the Wellington subsidiary of NZ Bus in New Zealand. It was branded "Stagecoach Wellington" by its previous owner, the Stagecoach Group.