Complex sentence: It was one of the first large ashrams to be established in Rishikesh, prior to which it was mostly as a place for individual seekers, or pilgrims to stop over on way to Char Dham temples pilgrimage.
Split into simpler sentences: It was one of the first large ashrams to be established in Rishikesh. Before that it was mostly as a place for individual seekers or pilgrims to stop over on way to Char Dham temples pilgrimage.