Complex sentence: With the Temenggung's help, Raffles managed to smuggle Hussein, then living in exile on one of the Riau Islands, back into Singapore.According a correspondence between Tengku Hussain and his brother, he left for Singapore out of his concern of his son's safety.
Split into simpler sentences: With the Temenggung's help, Raffles managed to smuggle Hussein, then living in exile on one of the Riau Islands, back into Singapore. According to a correspondence between Tengku Hussain and his brother, he left for Singapore out of his concern of his son's safety.