Complex sentence: The islands have a total area of 2,600 hectares, the North island is 12.5 km long and 1.5 km wide and South island 7 km long and 4.5 km wide.
Split into simpler sentences: The islands have a total area of 2,600 hectares. The North island is 12.5 km long and 1.5 km wide, while the South island is 7 km long and 4.5 km wide.