Complex sentence: While encouraging the rulers to act with patriotism, Patel did not rule out force, setting a deadline of 15 August 1947 for them to sign the instrument of accession document.
Split into simpler sentences: While encouraging the rulers to act out of patriotism, Patel did not rule out force. Stressing that the princes would need to accede to India in good faith, he set a deadline of 15August 1947 for them to sign the instrument of accession document.