Original: The Romans had allied themselves to the Maccabees and interfered again in 63 BCE, following the end of the Third Mithridatic War, when general Gnaeus Pompeius Magnus stayed behind to make the area secure for Rome.
Simplified: After the defeat of Mithridates VI of Pontus, general Gnaeus Pompeius Magnus (Pompey the Great) stayed behind to make the area secure for Rome.