Complex sentence: The New Zealand Kaka is a medium sized parrot, around 45 cm (18 in) in length and weighing about 550 g, and is closely related to the Kea, but has darker plumage and is more arboreal.
Split into simpler sentences: The New Zealand Kaka is a medium sized parrot, measuring 45 cm (18 in) in length and weighing from, with an average of. It is closely related to the Kea, but has darker plumage and is more arboreal.