Explanation:

The complex rituals and sacrifices of the Brahmins in the later Vedic period weren’t acceptable to the common people. The sacrifices and rituals were too expensive and mantras and superstitions confused the people. The teachings of the Upanishads were philosophical in nature and weren’t easily understood. The common man needed simple, short and intelligible ways to salvation. The religious teachings should be in a language known to them. Jainism and Buddhism fulfilled this need.