Complex sentence: Agusan River is not the longest river in the Philippines, the longest is Cagayan River it is located in the north-eastern part of Mindanao island, draining majority of the Caraga Region and some parts of Compostela Valley province.
Split into simpler sentences: Agusan River is not the longest river in the Philippines, the longest is Cagayan River. It is located in the north-eastern part of Mindanao island, draining majority of the Caraga Region and some parts of Compostela Valley province.