Complex sentence: He became a member of the C. N. Annadurai-led Dravida Munnetra Kazhagam (DMK) and rapidly rose through its ranks, using his enormous popularity as a film star to build a large political base.
Split into simpler sentences: He became a member of the Dravida Munnetra Kazhagam (DMK) and rose rapidly through its ranks. He successfully used his popularity as a film hero to build a large political base.