Complex sentence: He intially joined the Janata Party but later resigned and in 1979 he revived the BJS under the name Akhila Bharatiya Jana Sangh, but was not sucessful.
Split into simpler sentences: He intially joined the Janata Party but later resigned and in 1979. He revived the Bharatiya Jana Sangh under the name Akhila Bharatiya Jana Sangh, but was not sucessful.