Complex sentence: Being a popular actor, his fan clubs became the electoral mobilization--the head of his fan club association, R.M. Veerappan became a lieutenant and fellow actress, J. Jayalalithaa was groomed as a possible heir apparent.
Split into simpler sentences: Being a popular actor, his fan clubs became the electoral mobilization. The head of his fan club association, R.M. Veerappan, became a lieutenant, and fellow actress J. Jayalalithaa was groomed as a possible heir apparent.