Complex sentence: In 541 BC, his second elder brother Wei murdered his nephew Jia'ao of Chu and usurped the throne, Bi ran off in fear as well as his fourth younger brother Heigong.
Split into simpler sentences: In 541 BC, his second elder brother Wei murdered his nephew Jia'ao of Chu and usurped the throne. In fear, Bi ran off as well as his fourth younger brother Heigong.