Original sentence: In 1960, he was appointed Secretary of State for War (a now obsolete title) under Harold Macmillan, but became embroiled in a relationship with Christine Keeler, a showgirl who was simultaneously involved with an attache at the Soviet Embassy
Edited sentence: In 1960, he was appointed Secretary of State for War (a now obsolete title) under Harold Macmillan, but became embroiled in a relationship with Christine Keeler, a showgirl who was simultaneously involved with a Russian KGB official