Complex sentence: He intially joined the Janata Party but later resigned in 1979 and revived the Bharatiya Jana Sangh under the name Akhil 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 Akhil Bharatiya Jana Sangh, but was not sucessful.