Original sentence: He uses these powers in the Foundation series, where he acts as "Eto Demerzel," an advisor to Cleon I, and "Chetter Humin," a friend of Hari Seldon, and by having Golan Trevize to rediscover Earth
Edited sentence: He uses these powers in the Foundation series, where he acts as "Eto Demerzel," Chief of Staff to emperor Cleon I, and "Chetter Humin," a friend of Hari Seldon, and by having Golan Trevize to rediscover Earth