Why was India split into two and later three separate nations following World War 2 and what three countries did it become?

Indian minority group , The Muslims demanded for a self ruling independent country, at present , "Pakistan" which was followed by another demand of giving the eastern minority groups an independent country which is now "Bangladesh".

For the why part, no official reason was given by Britishers, governing body explained those two provinces Punjab and West Bengal, as too large to govern effectively. It was seen as an attempt of "divide and rule" which India still pays for and will continue paying.