Complex sentence: The river's source is west of the Stirling Ranges' it rises north west of Kendenup and flows generally southwards until it reaches Oyster Harbour about 10 km northeast of Albany.
Split into simpler sentences: The river's source is west of the Stirling Ranges. It rises north-west of Kendenup and flows generally southwards until it reaches Oyster Harbour about 10 km north-east of Albany.