Complex sentence: Before the next round, Huo unknowingly drinks from a of tea, poisoned by the members of the foreign chamber of commerce, who are in attendance and wish to assure their victory.
Split into simpler sentences: Before the next round, Huo unknowingly drinks from a poisoned cup of tea. The poisoning is the work of the members of the foreign chamber of commerce, who are in attendance and wish to assure their victory.