Complex sentence: For a brief history of the origins of the Indian flag we have to go back to 1 August 1906 to the Parsee Bagan Square (Green Park) at Calcutta where the first national flag of India was hoisted.
Split into simpler sentences: For a brief history of the origins of the Indian flag we have to go back to August 1,1906. It was at Parsee Bagan Square (Green Park) in Calcutta where the first national flag of India was hoisted.