Complex sentence: During the War of Independence from 1945-1949, the cabinet changed from a presidential to a parliamentary system, despite this not being the system intended by those who drew up the Constitution; however, at several critical periods, it reverted to a presidential system.
Split into simpler sentences: During the War of Independence from 1945-1949, the cabinet changed from a presidential to a parliamentary system, despite this not being the system intended by those who drew up the Constitution. However, at several critical periods, it reverted to a presidential system.