Complex sentence: Its closest neighbours are the small island of Tafahi, only 9 km towards the north-northeast, and the similar island of Niuafo'ou; the three islands together form the administrative division of The Niuas.
Split into simpler sentences: Its closest neighbours are the small island of Tafahi, only 9 kilometers to the north-northeast, and the similarly island of Niuafo'ou. The three islands together form the administrative division of The Niuas.