Complex sentence: Mahakam River is the largest river in East Kalimantan, Indonesia, with the catchment area of about 77,000 km 2, which lies between 2 ˚ N to 1 ˚ S latitude and 113 ˚ E to 118 ˚ E longitude.
Split into simpler sentences: Mahakam River is the largest river in East Kalimantan, Indonesia, with a catchment area of approximately 77,000 km 2. The catchment lies between 2 ˚ N to 1 ˚ S latitude and 113 ˚ E to 118 ˚ E longitude.