Complex sentence: The Mekong river, the twelfth longest river in the world cuts through the very heart of Cambodia, and the capital Phnom Penh is situated on its riverbank, at the junction where two other rivers meet, the Tonle Sap and Bassac.
Split into simpler sentences: The Mekong river, the twelfth longest in the world cuts through the very heart of Cambodia. The capital Phnom Penh is on its riverbank, at the junction where two other rivers meet: the Tonle Sap and Bassac.