Complex sentence: With the British threatening to invade Malaya and with daily American aerial bombings, Bose's presence in Singapore was becoming riskier by the day, and his chief of staff J. R. Bhonsle suggested that he prepare to leave Singapore.
Split into simpler sentences: With the British threatening to invade Malaya and with daily American aerial bombings, Bose's presence in Singapore became riskier by the day. His chief of staff J. R. Bhonsle suggested that he prepare to leave Singapore.