Complex sentence: Periyar Ramasami who started the Dravidian movement was elected leader of the Justice Party in 1938 and in 1944 renamed it to Dravidar Kazhagam; with its initial aim being the secession of "Dravida Nadu" from the rest of India on independence.
Split into simpler sentences: Periyar Ramasami who started the Dravidian movement was elected leader of the Justice Party in 1938. The initial aim was the secession of "Dravida Nadu" from the rest of India on independence.