Complex sentence: The Congress Party is structured in a hierarchically manner and the organisational structure, created by Mohandas Gandhi's re-arrangement of the Congress in the years 1918--20, has largely been retained until today.
Split into simpler sentences: The Congress Party is structured in a hierarchically manner. Its organisational structure, created by Mohandas Gandhi's re-arrangement of the Congress in the years 1918--20, has largely been retained until today.