Complex sentence: The family had fled war-torn Chechnya in the 1990s to Russia's Saratov Oblast, where they resided until the late 2000s, before moving moved back to Grozny, where his father became a high-ranking pro-Moscow official in the city administration in 2008.
Split into simpler sentences: The family had fled war-torn Chechnya in the 1990s to Russia's Saratov Oblast. They resided there until the late 2000s, before moving moved back to Grozny, where his father became a high-ranking pro-Moscow official in the city administration in 2008.