Complex sentence: The Indian Independence Act was passed on 18 July 1947 and, although it was earlier declared that India would become independent in June 1948, this event led to independence on 15 August 1947.
Split into simpler sentences: The Indian Independence Act was passed on 18 July 1947. It had earlier been declared that India would get its independence in June 1948, but this event led to early independence on 15 August 1947.