Complex sentence: In 1921, the "Diarchy" was installed in Bengal, Madras, Bombay, United Provinces, M.P., Punjab, Bihar, Orissa and Assam and in 1932, it was extended to the North-West Frontier Province.
Split into simpler sentences: In 1921, the "Diarchy" was installed in Bengal, Madras, Bombay, United Provinces, M.P., Punjab, Bihar, Orissa and Assam. In 1932, it was extended to the North-West Frontier Province.