Complex sentence: The river rises from the Tenasserim Range at a height of and after passing the town of Tanintharyi (Tenasserim) flows into the Andaman Sea near Myeik (Mergui), about north of where the Lenya River enters the sea.
Split into simpler sentences: The river rises from the Tenasserim Range at an altitude of and flows into the Andaman Sea. From here it flows into the Andaman Sea near Myeik (Mergui), about north of where the Lenya River enters the sea.