Complex sentence: Cassava is widely cultivated and eaten as a staple food in Andhra Pradesh and in Kerala besides being commonly cultivated and popular in Assam, where it is an important source of carbohydrates especially for natives of hilly areas.
Split into simpler sentences: Cassava is widely cultivated and eaten as a staple food in Andhra Pradesh and in Kerala. In Assam it is an important source of carbohydrates especially for natives of hilly areas.