Complex sentence: Manimala got its name after Manimalayar which is one of the major rivers of Kerala, about 92km in length, originating from Sahyadris (Westernghats).
Split into simpler sentences: Manimala got its name after Manimalayar which is one of the major rivers of Kerala. It is about 92km in length which originates from Sahyadris (Westernghats).