Complex sentence: Some of the royal members with the surname Si including the prince of Zeng fled to the State of Lu and the Prince of Zeng gave his descendants the surname Zeng in remembrance of the Zeng state.
Split into simpler sentences: Some of the royal members with the surname Si including the prince of Zeng fled to the State of Lu. The Prince of Zeng gave his descendants the surname Zeng in remembrance of the Zeng state.