Complex sentence: The northern catchment of the Alaknanda River where the sanctuary is located, which originates beyond Kedarnath temple, has a series of generally north-south trending river valleys formed by the Mandakini, Kali, Biera, Balasuti and Menan rivers.
Split into simpler sentences: The northern catchment of the Alaknanda River where the sanctuary is located originates beyond Kedarnath temple. The river valleys, generally in a north-south direction, are formed by the Mandakini, Kali, Biera, Balasuti and Menan rivers.