Complex sentence: In India, s. plagiostomus is the most important food fish of Himalaya region including Kashmir, Himanchal pardesh, Utarakhand, Uttar pardesh foot hills, Assam etc. (Day, 1958) and also plays an important role in commercial fish production (Bahuguna, 2002).
Split into simpler sentences: In India, "S. plagiostomus" is the most important food fish of the Himalayan region, including Kashmir, Himanchal Pradesh, Utarakhand, the Uttar Pradesh foothills and Assam (Day, 1958). It also plays an important role in commercial fish production (Bahuguna, 2002).