Original: Although his earliest school records state that he was born on October 20, 1875, Sarojini Naidu, the author of Jinnah's first biography, gives the date as ”December 25, 1876”.
Simplified: The earliest record of his school register gives his date of birth as 20 October 1875. Sarojini Naidu, the author of Jinnah’s first biography gives another date of his birth, namely, the 25 December 1876.