Complex sentence: Earlier he had served as the elected President of an agricultural cooperative bank and was closely involved in the activities of the Swadeshi Jagran Manch holding different responsibilities, including as a member of its National Working Committee.
Split into simpler sentences: Earlier he had served as the elected President of an agricultural cooperative bank. He is closely involved in the activities of the Swadeshi Jagran Manch and had held different responsibilities including as a member of the National Working Committee.