Complex sentence: Several days later Xuan returned to the court alive due to his ability to remain underwater for long periods of time as a result of his skills in "embryonic breathing", and his ability to control wind, the rain and rivers.
Split into simpler sentences: Several days later Xuan returned to the court alive, apparently due to his ability to remain underwater for long periods of time. He was able to remain submerged as a result of his skills in "embryonic breathing", and his ability to control wind, the rain and rivers.